Hopeville Pond State Park is certainly one to visit during the summer! While we did not go there to swim, there were lots of families enjoying the pond. It was an extremely hot day and we didn’t even get in a hike unfortunately.
I imagine it’s a great lake to kayak or canoe. It took me two hours to get to the park so I combined the adventure with a visit to Buttonwood Farm ice cream stand and sunflower field. Highly recommend doing that and making a day of it!