Technically speaking, Bryce Canyon isn’t a canyon. It’s an amphitheater.
That being said, whatever you call it, Bryce Canyon is incredible. It isn’t the biggest national park, but the Bryce Canyon Amphitheater is an incredible thing to experience.
If you visit Bryce Canyon, I’d recommend waking up to watch the sunrise over the amphitheater. Afterwards, you can spend the morning walking along the hoodoos. The area is small enough such that you can easily get a good park experience in a single day.
A visit to Bryce should also be paired with a visit to Zion, which is within driving distance.