My husband and I went in to rent mountain bikes for a self-guided ride in La Fortuna...although we had no idea where to go. Upon arrival, the owner quickly assessed that we were fit enough to do his 'training ride' and he explained to us (in great detail) how to link up this amazing circuit through town, up to the hills, across a ridgeline, and down through the fertile valleys near The Springs resort. He gave us awesome bikes, along with a repair kit and a spare tube, which was above and beyond what we were expecting. The ride was epic (albeit very strenuous in the heat and humidity), and the views of the volcano on one side and the 'flatlands' on the other were out of this world. Bike Arenal gave us a day of great memories on a trip already packed with awesomeness, and we can't recommend them enough. If you like biking, this is the place to go!