Silversea Wellness Expeditions deliver on the name by integrating healthy living onboard and off. That means that while exploring Thailand and Indonesia, you can enjoy fitness programs by Technogym; healthy menus and nutritional counseling; yoga, Pilates, and aquagym classes; wellness-themed lectures and cooking demos; and one complimentary spa treatment per traveler. Plus, stops at places like Ujung Kulon National Park offer up opportunities to stretch your legs on land. Set on Java’s remote southwestern tip, this UNESCO World Heritage-listed national park is a wonderland of virgin beaches, rainforests, and coral reefs that’s populated by wildlife of all types, from monitor lizards to wild boars to exotic birds. In the morning, hike through the tropical forest of Peucang Island, finishing with a swim or snorkel. As you replenish with lunch on the ship, you’ll cruise into the Sunda Strait to reach Anak Krakatoa, a volcano that rose above sea level in 1930 and has grown steadily ever since. You know you’re arrived when your view is full of active fumaroles, lava flows, colored rocks, and the majestic volcano itself.