http://en.wikipedia.org/wiki/Rainbow_Bridge_National_Monument
The Rainbow Bridge boat trip was not on my list but it was a very pleasant 7-1/2 hour journey on Lake Powell. The final mile or so traversing the narrow canyons was outstanding. To get to the Bridge required a 1-1/4 mile hike up uneven trails which I considered quite easy compared to the very, very steep hike from the boat back to the starting point hotel. If they offer you a ride in the golf cart take it.
