Starvation Canyon has a fun scramble/hike from the Big Joe campsite. Mantle Cave is a short hike, but an interesting spot to check out. Sand Canyon is also pretty cool. If your group is up for a little light scrambling, then follow the canyon up. If you prefer a more straightforward hike, there's a trail up to the left that skips the little slot canyon part at the beginning and joins back up with the canyon trail ~1/4 mile up.