What's your preference: trekking through virgin rainforest, zip-lining through the jungle, sea kayaking? On the Pacific side of this peaceful Central American nation, the Osa Peninsula is a tropical, eco-tourist paradise that's quick and easy to reach by air from the capital city San Jose. Besides the Corcovado National Park with its secluded beaches, there is some of the most diverse wildlife on the planet, funky towns, friendly people and world-class resorts. If you want a lot of choices in once place, this is the place. There are many travel guides available online.