Tortuguero National Park protects tropical rainforest - one of the biggest swathes in Central America - which has an abundance of wildlife and excellent lodges with naturalist guides. Lodges provide comfortable accommodation for the duration of a Tortuguero National Park tour and knowledgeable natural history guides will take you out on foot or by boat through the waterways to explore the thick jungle. Volunteer to spend a season (June to November) protecting the Tortuguero beaches where huge numbers of green turtles come ashore to lay their eggs.