I floated that stretch between Cisco and Dewey couple times as a guide working down there few years back, can't say I'd do it again haha! There's just not much to see scenery-wise, and like DoStep said there's a surprising amount of private ranch land as well.
The only blm site I know of is Fish Ford, it's a dirt boat ramp/car camp site on river right, but I don't think it's more than a handful of miles downstream of Cisco. In fact you can check it out on your way to the Cisco ramp by taking the right turn at the fork instead of the left if you want. If you got a late start that'd be my suggestion, though I did camp a little further downstream on the left once, on what was likely ranch land as there were cow-pies everywhere.
Mid-May should have a lot of fast current though, so if you start at a decent time you could easily make it to Dewey Bridge for the first night. That would make for a shorter second day though as I would also highly recommend staying at one of Onion Creek sites. There's 3 of them immediately after OC rapid all on river right, first 2 are the best imo.
Just take your time 2nd day, there's a side canyon couple miles downstream of Dewey that'd be worth exploring, also a big rock feature just past the rich guy's house on the left that you can cliff jump off of
Or hell if you get to camp too early, just explore the area behind the camp, or walk upstream and swim the rapid back down.
If you're going all the way to the Moab bridge, 3rd night at Big Bend campground is your only option really, river left and first come first served camp sites that are a bit of a walk from the boats.
Anyways, I've said too much already but if you have any questions let me know! Have fun, that daily stretch has some of the best scenery anywhere