Dominica's biggest selling point for adventurous travelers is its nature beyond the beaches. The Caribbean island is home to the world’s second-largest hot springs—Boiling Lake—along with waterfalls, rivers, and a massive canyon. Popular activities include canyoning and rappelling in the Titou Gorge, trekking through the UNESCO-listed Morne Trois Pitons National Park, and paddling on freshwater lakes and rivers. Just be aware that many outdoor activities in Dominica require special equipment or know-how and are best done with a guide’s assistance.