Skip the crowded beach resorts for a day and hit the mud. The hike-and-swim combo is the only way to do it; you want the guide to show you the hidden jungle pools rather than wandering aimlessly. Spend four hours here, but wear actual hiking boots—flip-flops will fail you on the slick slopes. The $100 tour is better than the basic walk. Go early to avoid the midday cruise ship humidity.
