At Kelly's Island, there is one public beach available at the State Park. Not many great options, still the first time we went there, we had the beach pratically to ourselves. It was later in the evening on a Thursday night. At first we were just planning on checking out the beach area (Steve and I had not come down here on our last visit), but after putting their feet in the amazingly warm water (very surprising for a lake), the kids just had to get on their suits and take a dip.
Later on, they had great fun making sand castles with Grammy.
There were several canoes and kayaks stacked up along the end of the beach, and Alexa and Jared just had to climb up inside them. They were very disappointed we couldn't take one out then, and the next day, after we found out it was $18 for a half hour, we said no thanks again. We'd rather save renting a boat for our next big vacation in the middle of September.