Goblin Valley for a couple hours then head over to Little Wild Horse Canyon or Bell Canyon down the road for a couple hours. Hoodoos and slot canyons, great way to spend the day if you're into cool land features and hiking.
Bears ears if you enjoy some beautiful scenery and Native American archaeological sites. You’ll need a day pass for the best stuff, but there are some great historical sites to hike to.
My family prefers Goblin Valley, but we usually hike the slot canyon loop while we’re there.