As far as ashrams go, Sivananda's approach to yoga is as traditional as it comes. What separates it from the pack, though, is its otherworldly Paradise Island location. Flanked by dense tropical gardens and white-sand beaches, the retreat makes next-level nirvana seem totally achievable. But don't be fooled by the idyllic setting, the yogic lifestyle is fully immersive here: A 5:30am wake-up call marks the beginning of a jam-packed day consisting of two mandatory meditations, two yoga classes, lectures, chanting, and nature walks. Accommodations are humble yet comfortable and range from shared beach huts and dormitories to private tents and garden rooms. At mealtime, the fare is vegetarian and prepared fresh on-site. Be sure to check the schedule as they host really interesting retreats.