Virtually all the Southern Utah hikes already mentioned and others like:
Yellow Rock and surroundings
Hike to the Solstice Snake
Otho Arch
Hidden Valley
Wire Pass, Buckskin Gulch to Edmaiers Secret (loop with shuttle)
Mule Tower Ruins +3 levels of ruins down into the canyon below
Mule Canyon via House on Fire up to Wall Ruin.
Owl Canyon upto Nevill's Arch.
Squaw Canyon - Lost Canyon loop (possibly including Big Spring Canyon)
The non-technical part of Egypt 3 slot canyon (slim people only!).
Hurst and Exclamation Bridge.
Ding & Dang Slot Canyon loop (when dry)
The Citadel
Moonhouse and surroundings left and right
And for the more ambitious dayhiker:
Peekaboo Campground to Angel Arch
Mouth of Davis Canyon to Klingon Battle Cruiser Arch