You need to do some research on the trails he is planning. Moab has easy trails and advanced trails. Not much in between. Check out some of the day tours and skills clinics. You may need to negotiate you going on some day tours more suited to your skills while he does the more advanced trails. People die on some of those trails. Do not get in over your head.

Klondike Bluffs if the perfect first step for slickrock riding with some cool dinosaur tracks for icing on the cake. It can be loads of fun. They also just built a new trail, the Sovereign.

Call and talk to some tour operators like www.rimtours.com (Jenna is the day tour mgr) before you make any commitments. You could have a great time if planned right but BF will need a day or 2 to ride the advanced trails without you. You could even go rafting one day while he rides.