I have already been there and done that, but it was so much that that I really want to go again. I went with my uncles and cousins from Maui and the first picture is actually my own picture. When they first told me about doing this, I didn't think it would be that great but it was a really great experience. You ride from the top of Haleakala all the way to the bottom on a mountain bike. The first part of the trail is all dirt and lava rock, the second part is the forest and single trail, and the last part is all paved road. The second part I think is the most fun. The trail is small and you have to maneuver between trees, over roots and down steep slopes. It's the most tricky. I really don't like the last part because you pick up a lot of speed. We rented bikes from a shop and they were disk brakes, and they were already worn down when we got them. Not even a quarter way down the paved road and most of our back brakes are useless and don't help us slow down much. So we needed to pump our front brakes the rest of the way down and that was the worst feeling ever. You press it too hard and you're going flying over the handle bars. This is definitely worth the pain you're in the next day and if you ever get the chance to do it, I highly recommend it. Just make sure your rear brakes are good to go!