You would not believe how many outdoor adventures Moab has to offer. We recommend renting an Airbnb, VRBO, or hotel just so you have a cozy bed and shower because if you're like us then you're biking, hiking, or off-roading until you drop each day.
Favorite MTB trail: Mag 7 (https://www.trailforks.com/region/mag-7-17329/)
Favorite hiking trail: Delicate Arch Trail (https://www.alltrails.com/trail/us/utah/delicate-arch-trail)
The city's website has everything you will need, including shuttles and lodging, https://www.discovermoab.com/.
You will want more than 2 days in the desert oasis.