We booked the tour via our hotel. The fee seems reasonable for a private English tour guide. William picked us up at the hotel promptly and was professional from the very beginning. He was very knowledgeable about the area and provided background information about the gorge and Taiwan in general. What I enjoyed most about the tour is that he provided options for us to choose and was well prepared (having panchos and crocks available when we decided to venture in the water curtain tunnel!). It was also refreshing to not be taken to places where the sole purpose is to buy souvenirs. Overall, we had a fantastic time and would recommend anyone visiting the Taroko Gorge to use William. He even took us to local street vendors prior to dropping us off the hotel, which is definitely not part of the agenda!