Sizzling thermal waters flow from volcano-heated springs in remote, rugged Patagonia. It’s the ideal spa destination for those who want some eco-adventure when they emerge from the therapeutic waters. The most decadent spa address is Puyuhuapi, in the north of the region, accessible only by boat.

Abundant wildlife above and below the waves draws eco-tourists to Ecuador's Galapagos. Get up close on a stroll or in a Zodiac boat. Snorkel and dive with denizens of the deep, from sea lions to sea turtles at Santiago's Cousin's Rock. Hike along the Darwin Trail and see finches, flamingos and iguanas. Admire Sierra Negra Volcano on Isabela. As visitor numbers are limited within the islands' National Park, book your boat tour through a tour operator. Visit between January and April for the best snorkelling.

Stretching from the fishing village of Puerto Morelos to the biosphere reserve of Sian Ka'an, the Mayan Riviera offers an unforgettable Caribbean coastline experience. Divers and snorkelers will be dazzled by the wrecks of Xcaret and the Puerto Morelos reef. Use a zip line to descend into the sacred subterranean caverns of LabnaHa Eco Park, where you can snorkel an underground river under a canopy of stalactites. The nearby Tulum Monkey Sanctuary will put you in a playful mood.