Saw a sign in the parking lot at the Trading Post at Fish Creek Pond. The office is hidden behind the Trading Post - go all the way to the back, past the gate, around the corner. This is an established campground that has a lot of returning campers, so they don't advertise, don't have a website or a brochure. They do not have freestanding bathroom facilities; you must have a self-contained unit to stay there. I was there midweek in August and it looked like there were some empty sites, but this was a Covid season. If you want to camp in the Saranac Lake area and want hookups, it may be worth giving them a call. It's on the lake and offers both a boat launch and a beach.
The deli in the trading post sells barbecue and there's an ice cream stand out front, too. The trading post carries basics and sells gas.