Might be heading down to Moab, camping at Sand Flats by Slick Rock. Any particularly good spots right around there to throw up a top rope for my 4 year old?

not exactly close to Slick Rock, but the slabs on Potash are very easy to scramble up the side of

There are hundreds of slabs all over Sand Flats area. You will have to improvise your belay. Perhaps belay from above. Plant your butt firmly somewhere if there is nothing else. Or find a slab you can park you car on top.