As per the previous poster, 4 Mile Creek State Park (NY) puts you right on Lake Ontario. Access to any other NY State park is free with your window tag, including parking at the Falls which is about 20 minutes of easy highway from there. You can even walk across the bridge to Canada (with your passports) for an experience of sights and sounds called Clifton Hill. Fort Niagara is a few minutes away, which is fun to visit. There are beautiful sites along the lake, and even if you can't get lake front, all of the sites are huge. This place is one of our favorites when we camp in that area. Lake Erie State park is nice, but there is nothing to do in the area.