Even though the trail follows the path of the creek (generally speaking) it actually doesn't come very close to it except in a few spots. You could camp of course at fairly bridge landing (though I'm not sure about swimming there as I didn't go down near the water). A great spot to camp is on the sandbar that I mentioned which is about 3 miles or so from fairly bridge landing and would also be a good spot to swim. You could also camp at the intersection of beaver dam creek and black creek and maybe swim there too.
As for the rest of the trail; you'd have to ask someone else b/c I do not know.