Kelleys Island is a lovely location for camping and relaxing. We had a premium tent site at the state park campgrounds, right next to the lake and literally feet from the beach. The weather near the Canadian border is a relief from the mainland heat and humidity, and the residents and visitors are laid back.
The island is easy to get around, either by car, golf cart, bike or foot. Many residents sell bundles of wood for campfires. The campground is well tended with some of the better restroom/shower facilities I've seen. We are definitely going to make this a yearly visit!
The only complaint I have is that the convenience stores stock some rather strange merchandise. Only one store had any fresh produce, and there wasn't much at that. For example, I tried to purchase sugar at Uncle Dik's across the street from the campground. Not only were they out of stock in their one-aisle grocery/supplies area, but they couldn't sell me any from their coffee area. But they had plenty of sundresses and knick-knacks in the store.
Overally, a pleasant, relaxing experience.