I can recommend this tour and bike arenal to everyone who wants to make a biketour in this region. Alejandro and his Staff are very friendly and on the Tour to El Castillo, he explained also a little bit about the Volcano and the surrounding. About the ride: I think it's really possible to do for everyone who is a little bit sporty, so the road is mostly flat (but bumpy). If you're expecting a uphill/downhill-ride, you better go to the shop and to alejandro himself! He will give you the best pura-vida-bike experience in arenal area!