Staying at Lazy Beach is like going to a tropical summer camp: The rooms are simple, with mosquito nets, double beds, and cold-water bathrooms, and the activity options consist of swimming, sunbathing, snorkeling, and hiking 20 minutes through thick jungle to the heart-shaped bay on the island's east side.

CNN: The secret islands of Southeast Asia

In addition to seeing and barely believing the animals so up- close, an Endeavor expedition offers long and short hikes, coastal explorations by kayaks or Zodiacs, swimming, snorkeling, or floating in a glass bottom boat for amazing undersea viewing.

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