Hey Blu Diver,
Lake Ouachita would be the choice, although it is dry-suit season at this time. We are very limited on shore access, with the only real place being the dam. The dam site requires a lot of walking down a long flight of stairs, but is a pretty decent dive. There are several sunken boats, and various other objects cabled together in the 20-30 ft range. They are all located about mid-way across the dam so I'd recommend surface swimming until you get close to half way. ( or swim at 5-10 ft)
Good luck!
Howard Sublett
Scuba and Archery Center
Hot Springs, AR