The underground-spring-fed Aquário Encantado here has incredible visibility down to its maximum depth of 6m and schools of fish that mill about as you explore the underwater world. 'Aquarium' aside, you can snorkel-float 850m along the Rio Salobra on the same fazenda (farm). It's 10km from town. Guides are on-site but you'll usually need to book your time slot ahead.