Replying to Plan my trip in Moab, Utah!

So me and a friend are driving from CO to Moab for 5 days. We plan on camping or sleeping in the car. Neither of us have been and we don't really have a plan on what were going to do.

So what are some things we can do. I want to mountain bike, hike, maybe rafting, I really dont know. What are some things to do that are popular and what are some of the unknown but awesome things to do? Where should we stay/camp? What do we need to bring? Can we rent bikes nearby, or should we get them in CO.

Those are just some of my questions? Thanks!