Avid travelers, intrepid adventurers, and culture enthusiasts eager to make up for lost time are circling their calendars for this year and beyond. But with the masses also looking to vacation with friends and family, the world’s most in-demand travel destinations and experiences are likely to be busy and crowded. Here’s a look at some of the world’s best under-the-radar travel options.

Historic Hot Springs and Via Ferratas in the American West

Active travelers looking to take their adventure game to another level are seeking out via ferratas (Italian for “Iron Way”), climbing routes that employ steel cables, rungs, and ladders affixed to natural rock formations. One of America’s newest and most expensive via ferratas is found at Castle Hot Springs, a historic resort north of Phoenix that has been revitalized in recent years to become one of the country’s most luxurious destination resorts. After walking across a 200-foot long aerial walkway high above the cactus-strewn canyon floor, guests recover in one of three therapeutic hot spring pools, with temperatures reaching 115 degrees Fahrenheit.

Visitors to Colorado can explore the 720-mile, Historic Hot Springs Loop, which incorporates five inviting destinations in the western part of the state. The 19 hot springs facilities offer unique features such as vapor caves, hot pots, terraced pools, and gigantic travertine formations. Highlights include the charming alpine town of Ouray, known as the “Switzerland of America,” and historic Pagosa Springs, which offers a convenient base in The Springs Resort & Spa, where guests enjoy access to 24 soaking pools ranging from 83-114°F. Overlooking the picturesque San Juan River, the pools are filled with mineral water from the resort’s “mother spring,” which has been measured to 1,002 feet deep, making it the world’s deepest measured geothermal hot spring.

The tony ski town of Telluride offers one of the country’s most jaw-dropping via ferrata routes, thousands of feet above the town’s famed boxed canyon. Guides are not required, but with its challenging course, featuring metal ladder rungs bolted onto a sheer cliff face, not to mention gorgeous views of Bridal Veil Falls, the course is not for the faint of heart.

Luxe Tropical Wellness in Lanai

The Hawaiian island of Lanai, which gets only a fraction of the visitor traffic received by neighboring Maui, is famously owned by the tech mogul Larry Ellison. Travelers often feel like they have the island to themselves, as crowds are rarely found across its pine-clad forests or glimmering shoreline. Ellison’s newest contribution to the island, Sensei Lanai, A Four Seasons Resort, is a secluded wellness enclave that distills preventive health science, data, and research into simple paths for everyday living. Guests can explore untouched wilderness, burn off calories in an outdoor adventure park or via myriad fitness and movement classes, and refuel with meals by Nobu, highlighting sustainable, local ingredients. Or guests can venture over to the island’s other destination resort, the oceanfront Four Seasons Resort Lanai, where the stunning grounds contain memorable spaces for R&R, namely stunning lagoon-style pools and museum-quality botanical gardens.

Next-Level Thrills in Alaska

Best known for its world-class salmon fishing, the majestic town of Ketchikan is home to Salmon Falls Resort. Situated at the southernmost entrance to Alaska’s iconic Inside Passage, the resort offers numerous intriguing activities, most notably float plane fishing in which, after a scenic chartered flight, guests land in remote spots to enjoy one-of-a-kind guided fishing experiences. Due to a lack of cruise ships and a decrease in charter fishing excursions, the wildlife watching and fishing is better than ever. The resort’s other bucket-list experiences include bear watching tours, wildlife watching boat safaris, salmon cooking demos, and wine pairings with salmon roe.

Located in a remote spot in Alaska’s Denali National Park, the Sheldon Chalet attracts big spending mountaineers—three-night packages cost around $35,000 for two guests, inclusive of a helicopter “flightseeing” tour, gourmet meals, five-bedroom luxe accommodations, all gear and equipment, and more. Once properly fitted with a climbing harness, snowshoes, helmet, and poles, guests attend the chalet’s glacier school. (No previous mountaineering experience necessary.) Others may simply prefer to relax around the fireplace or warm up in the sauna with views of Denali’s summit.

Situated 60 miles west of Anchorage, Tordrillo Mountain Lodge lures adventurers with its heli-skiing and other hair-raising pursuits; owner and heli-ski pioneer Mike Overcast opened the lodge with Olympic gold medalist Tommy Moe. Guests can tackle the only via ferrata in Alaska, or go bear viewing in a vintage 1956 Turbine Otter plane.

New Options, Spread Apart in the Maldives

Luxury travelers looking to enjoy world-class scenery and relaxation in private, secluded environs have long flocked to the Maldives. But with roughly 1,200 coral islands spread over 35,000 square miles, the destination offers an endless array of new locales to explore.

Located in Raa Atoll on Muravandhoo Island, Joali Maldives is one of the destination’s splashiest new openings, as well as its first immersive art resort. The 73-villa property places a distinct focus on design, having utilized the Istanbul-based design firms Autoban and Atolye4n, and Tokyo-based Studio Glitt. When not luxuriating in the postcard-perfect waters, guests take holistic wellness journeys and go on yachting excursions to spot whales and manta rays.

Another relative newcomer, the Vakkaru Maldives resort is memorably situated within the UNESCO Biosphere Reserve of Baa Atoll. A tropical wonderland filled with more than 2,300 fully grown coconut trees, the resort’s Work Well package—which includes a bespoke fitness program, personal assistant, and access to a private, oceanfront office—is perfect for executives looking to “work from home” in one of the world’s most scenic offices. Available to guests who book a stay for 21 days or longer, each Work Well residency includes a complimentary upgrade to a bigger villa with a well-equipped study.

For the ultimate private luxury experience, big spenders can buy out one of the Maldives’ priciest and most decorated options—for $35,000 per night. The small private island of Naladhu offers blissful seclusion; there are 20 elegant houses, each with a private pool and 24-hour dedicated butler service. The buyout includes exclusive access to other islands, and guests can enjoy activities such as deserted island picnics, private yacht cruises, in-room spa journeys, and more.

Hard-to-Reach Caribbean Highlights

With its natural hot springs and tropical rainforests, Dominica is one of the Caribbean’s hidden gems. The mountainous island nation is home to some of the region’s most spectacular rivers and canyons. Participants jump into secret waterfalls and natural pools, descend into deep gorges, hike through lush jungle, and rappel down giant waterfalls to drop into the water below.

Serious hikers make the trek to the island’s awe-inspiring Boiling Lake, the second-largest of its kind in the world. The journey to the lake—an ancient, natural cauldron of bubbling water that’s more than 200 degrees Fahrenheit—takes visitors through lush jungles, natural springs, and sulfur pools. The island is also home to the Caribbean’s first long-distance walking trail, the 115-mile Waitukubuli National Trail. With 14 contiguous segments, the trail can take experienced hikers nearly two weeks to complete in its entirety. Family-friendly and suitable for all types of hikers, the trail takes visitors through the island’s history, including indigenous Kalinago villages and ruins from 18th-century French settlements.

Over in the British Virgin Islands, eco-minded visitors to Oil Nut Bay on Virgin Gorda can try their hand at turtle tagging. The scenic island resort, surrounded by the Caribbean Sea on one side and the Atlantic on the other, sits in a turtle-rich environment. Turtle tagging boating adventures allow guests to swim alongside green sea turtles and partake in free diving to safely catch the turtles alongside a researcher. Turtles are measured, tagged, and released, and guests can then follow their adventures even after returning home.

A sailing paradise with 60 islands and cays, the British Virgin Islands are best explored on the water. Voyage Charters recently launched Electrified, its first solar-powered charter yacht and the first sustainable sailing option of its kind in the destination.

Those looking for a truly out-of-the-ordinary diving experience should head to Virgin Gorda’s Mountain Point, home to the islands’ newest diving mecca, the BVI Art Reef. In 2017, the Kodiak Queen—one of only five surviving ships from Pearl Harbor—was intentionally sunk with a large-scale sculpture of an 80-foot kraken. The project was created by a group of artists, engineers, scientists, and donors (including Sir Richard Branson) to raise awareness of ocean conservation. The site is a coral out-planting platform, which is facilitating a thriving new reef habitat while rehabilitating vulnerable marine life such as the goliath grouper.

Speaking of Branson, the islands’ most famous ambassador, his private island retreat, Necker Island has been fully restored after the devastating effects of Hurricane Irma in 2017. Those visiting in 2021 will be among the first to experience the island following its pricey restoration; in addition to two additional guest rooms in the Great House, three giant wind turbines have been installed, furthering the island’s commitment toward sustainability. Aquatic types pass the time with underwater sea adventures, while landlubbers can enjoy everything from private yoga and tennis to cave exploring. The starting rate for exclusive hire of the entire island, which includes use of 20 bedrooms, is $105,000 per night.