Although crowded, my ride on the Greenbelt through Austin's downtown was actually really fun. It wasn't the ride itself, but taking in the sights around town that I enjoyed. Near town, the trail follows the river on either bank and is primarily a gravel path. Needless to say, I was a bit over-prepared with my full face helmet and all-mountain bike. I just took the ride easy and snapped a couple photos instead of trying to mash the pedals, which worked out much better in the end.