The 1-Day Tour to Blue River Costa Rica Resort & Hot Springs is a day in a paradise. The rainforest beauty, the volcano views and the hot springs will enchant you. Adults will swim and soak in natural mineral “emerald green” hot springs for a calming sensation like no other. Kids will be sliding down the bullet water slide into the freshwater pool for hours on end. And that is just the beginning. Add a delicious lunch and guided tour to walk the blue river and a dip in the Grand Waterfall.