OTO is an incredible, well organized company. I was able to book my tour with them months in advance. I was originally supposed to do a volcano hike with them but decided at the last minute it was not for me. I wanted to switch to do a bike tour at the last minute and they were more than accommodating. The bike tour was engaging enough to keep all riders interested for the duration of the 4-hour ride with its highlight being a stop at a macadamia nut farm.