We live in Lake George and there is a RV park right next to where we live called Ledgeview Village RV Park
http://www.ledgeview.com/. I can tell you we stayed there many times before we moved here, as it is a very nice park. Lake George actually is located in the foothills of the Adirondacks, so you may wish to go even further north to get the real Adirondack experience. However, there is much to do here and it is beautiful. We are only 1 1/2 hours from Lake Placid. There are many RV parks, and if you are looking for scenery, you may wish to go further north. I'm not as familiar, because we don't camp where we live. If you let us know your preferences, we can ask around and private message you.