Love this place. We usually go twice a year. The park is big with a number of picnic tables, but it does get busy on holiday weekends so bring blankets for a picnic just in case all tables are full. They have a marina, a restaurant, a hotel, and campsites around the lake, and it's right outside Carlyle IL so if you forget anything or prefer not to pack a picnic, there's a grocery and a couple restaurants in town too. There is a nice sand beach close to the marina, and they don't allow glass on the beach either, so you can go barefoot if you like.
Very fun and free place to make memorable summer memories. No lifeguards so be careful but it is also a bonus as the privacy is kinda nice
Huge lake with lots to do. Eating establishments are slim off-season but there's a few places in town to go. Many campgrounds but I hear they fill up really fast. A few different beaches to enjoy. Different places to rent including hotels cabins and there are places on VRBO or Airbnb. Some good walking trails not to mention along the dam. Lots of picnic areas and a few playgrounds. There's enough there to keep the kids entertained or to get out and enjoy nature a little bit