You can rent UTVs and go drive in MOAB.. Rent MTBs... Also, do NOT miss going to Canyonlands National Park.. It's a short drive and basically just like the Grand Canyon.. Arches is really cool. Moab thins out tremendously after labor Day and it will be cold.
https://www.nps.gov/arch/planyourvisit/hiking.htm
https://www.nps.gov/arch/planyourvisit/maps.htm
Highly recommend the clockwise direction on the Primitive Trail through Devils Garden