We used Dimas to plan three tours while in Puntarenas: The Calypso catamaran, the Arenal/Baldi tour, and the Canopy tour over 11 waterfalls. From the beginning, Dimas was very honest and offered great prices - better than what we could get from our hotel (Doubletree) and he included a free trip to feed monkeys. In the end, we paid exactly what was promised and received great service; in fact, he didn't have us pay until after to make sure we enjoyed our tour. One note: try to bring cash as paying with credit card isn't preferred and can be more difficult.