Everybody we've met said we must go to Bonito - so we backtracked a couple of hundred km to do it, was the right choice. The main attractions are the rivers which are crystal clear and full of fish. We chose the Rio Sucuri - it was awesome. You're kitted out with wetsuit, mask and snorkel then dropped into the river near it's source, then you drift downstream for ~ an hour, about 2km, before they take you back out for a great lunch. We saw all sorts of fish, birds, more monkeys - fantastic. Unfortunately no photo's but for us another unforgettable experience.