The Springs Resort and Spavs?

"For such an active and adventurous destination, the mineral pools they have cannot be beat by anything for recovery from tired muscles and sore bodies." Full review

"With its own adventure park, hot-springs complex, and activities for all ages, this resort caters to both hotel guests and the outside public with day passes to its massive grounds." Full review

"This sprawling hot-springs resort in Arenal, with prices north of $500 (£380) a night, is the crème de la crème of luxury lodging in Costa Rica." Full review

"Set back from the Arenal Volcano, this magnificent hotel and its sprawling grounds are the mecca of hot springs" Full review

"The Spring Resort and Spa has three pools and 13 rooms and suites; it also offers doctor-supervised detoxifying water and juice cleanses."

"Complex features huge, comfortable rooms and great beds, but the key here is the wide range of on-site attractions and activity options, including an extensive collection of hot and temperate pools" Full review

"The 74-room luxury resort The Springs is 165 acres of seemingly endless pools and hot springs, restaurants, and activities -- all hidden on a volcano-facing slope seemingly in the middle of nowhere." Full review

"165-acre property sits on a mountain ridge, providing unobstructed views of the picture-perfect Arenal Volcano and valley below...multiple natural hot springs, waterfalls, and its own adventure center"