When we were living in NY, we enjoyed Sampson State Park and Watkins Glen State Park. The KOA in Watkins Glen is also popular but I would avoid it when races are taking place. Be sure to visit Corning and the Corning Glass Works. Take the Seneca Lake boat tour out of Watkins Glen, and hike as much of the Glen as you can. The Finger Lakes are beautiful and close enough to each other that you can take a lot of scenic drives. If you have the time, head a little further north and stay at Letchworth State Park which is on the Genesee River gorge. Excellent campground and just so scenic including waterfalls. They also do hot air balloon rides from Letchworth. My wife and I took a ride and it was amazing. And, wineries have made a comeback around the Finger Lakes and if you enjoy wine, you'll enjoy stopping at some of the wineries. Ithaca (home of Cornell and Ithaca colleges) is a great little town. Stop and walk around the downtown area.