If you want to do the ATV or bike rental type thing, might want to look at www.brycewildlifeadventure.com , located on SR12 between Bryce and Red Canyon rec area. Read the reviews tho, as the owner was kinda ignorant a couple of years ago.
Second the suggestion for Mystic River.
If you want to go real big, you might be able to find an aerial tour of some kind from Bryce Airport.
I'd opt for the equine ride at Bryce.
Was going to say the horseback riding in Bryce or the ziplines in Glendale.
The 3 hour horse backing ride into Bryce Canyon would be my pick. It includes a ride on the famous Peekaboo Loop that is amazing enough if you hiked it on foot.
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