Arenal Rafting was recommended to us by the driver who drove us from SJO to La Fortuna and we are so glad he did! I was a bit hesitant to try a class III/IV but my husband and kids were eager to go so I agreed. Didier, the guide on the bus ride to the river, was very clear explaining the safety rules and went over in detail what to do and more importantly, what not to do! Our raft guide, Alejando, was very energetic and made our experience so much fun. He let my kids ride on the nose of the raft and although we got bumped around a lot, we always felt safe. Would highly recommend them!