Normally, one wouldn’t equate "relaxing spa vacation" with "hanging out near an active volcano," but if you’re up for something more exotic than facials and massages, Banos might be the perfect place for you. The thermal mineral pools here are heated by the volcano, and while there are several, offering different amenities, the easiest one to visit is Las Piscinas de la Virgen. Banos also has plenty of outdoor activities, like rafting and biking on scenic paths.