A couple years ago, we stayed at King Phillip CG in Lake George. It was a decent CG and full hookup sites we about $25 less per night than Lake George RV resort. Probably not as much to for young kids at this CG but they had a nice pool and was the closest CG to downtown LG.
Down town had plenty of kid friendly attractions. Haunted houses, beach, boat rides, etc. Also cool rodeo nearby. There were 6 kids under 13 in our group and they stayed busy the entire time. We will definitely go back to Lake George and King Philip.
Steve