Playing on the Internet today and found this. Below is a website for boat launching ramps. OK.... I don' t have a boat, but I do love to camp on lakes and near water. When you click on the website the first page that comes up is a map of the U.S. Click on the state you wish-- and all sorts of information comes up... State Parks, BLM land, National Parks, Corps of Engineer parks, Government.com etc.
Could help you out when you are looking for a place to go in a specific state.
GEM
Enjoy and Happy RVing!
Joella