Lake Texoma has some nice COE parks with sites on the lake and there are marinas that rent boats.
I would not suggest the Lake Texoma SP as it is in sad shape at this time, plus you would still have to rent a boat from the marina.
One of our favorite COE parks on Texoma is Lakeside west of Durant, OK. But the sites on the lake are really popular and book fast. They do not have sewer hookups only W/E but have dump stations.
(I don't believe I just told the RV world about one of our favorite spots but I had to share!)
