Ready to run away together? Thanda Island off the coast of mainland Tanzania, Africa, is an impossibly romantic and delightfully exotic private islet. It’s also a private and protected marine reserve that comes with its own biologist! Until recently uninhabited, the 20-acre islet is now a concession of Swedish philanthropists and power couple Christine and Dan Olofsson. Long known for giving in Africa, the couple’s vision for this slice of paradise includes use of the island for marine research and conservation projects involving the region’s sea turtles, dugongs, and whale sharks, as well as the preservation and rehabilitation of the Shungimbili coral reef. Five guest suites and a spa overlook the Indian Ocean and your own private boat fleet for exquisite fishing, diving, snorkeling, and cruising the pristine Indian Ocean waters. Guests spend their days eating local Swahili- and Arabic-style dishes on the beach in between swimming with whale sharks, jet skiing, wakeboarding, SUP, diving, tubing and water skiing, tennis, and so much more. A 5-night buyout—for up to 10 adults and 9 children sharing, plus additional accommodations for up to 8 adults in two traditional Tanzanian two-story beach chalets—begins at $125,000.