If you are able to manage the same-day reservation, this campground is a great option for Custer. I planned my trip too late to stay at Sylvan Lake campground, but wanted to be near the Needles Highway since that was the reason this park was on my itinerary. There was plenty of vacancy on a late August weeknight. My site was next to the creek, which provided nice white noise at night. The showers were a short distance away, and even had hot water. The lake is a no-wake lake, and had I stayed for longer, I would have loved to paddle on it.