There is plenty to do in Bryce if you are staying for a while and want to get sweaty, with many hikes available to view the various hoodoos and other rock formations. But it is also worth a few hours for the casual motorcyclist visitor passing through, Highway 63 provides an easy out-and-back route down along the rim of the canyon, with many stunning scenic viewpoints.
The speed limit is low, traffic can be thick, and the road is well-patrolled so plan for the time needed to do the whole thing and stop for photos.
Tip: To help avoid traffic, try to arrive when the park opens in the morning and make a beeline straight for Rainbow Point at the end of the road. Enjoy the vista there, then take your time coming back along the park road, against the flow of the other tourists.