Spend four days at a lodge in and around Tortuguero National Park. The park is a land of canals and waterways lined by steamy jungle and mangroves teeming with wildlife, and is the Caribbean's most important breeding ground for endangered green sea turtles from June to August. A sleepy Caribbean town, Tortuguero has no roads—access is only by boat or small plane. If you're looking for unspoiled rainforest and more animals than you can shake a camera at, this is the place.