I would second renting from Canyon Voyages in Moab - nice people, good quality gear - rented from them a couple times before I bought my rafts.
As for San Juan, on Bluff-Mex Hat, gotta see the petroglyph panel at Butler Wash and do the hike to River House ruin. Limited campsites, but perched meander has nice views and there's a good one at 8-foot I think. Below Mex Hat, definitely camp and hike at Slickhorn - awesome pools and even though there are several camps, they're fairly well spread out - camp B or C are best I think. Grand Gulch is another good hike. Oljeto is woth the hike if you're camped there - can be a good camp - just depends on wind and how much beach there is/isn't.