We went to Kankakee River State Park about an hour away. The kids had such a great time exploring, wish that we could have done it more! Their favorite parts were catching fireflies in the evening. They loved the fire and cooking and seeing the river. We got to stop at horse farm (with a very reasonable riding fee) and the kids got to see a 5 day old foal!
We even had a great transition to bed in the tent. The only small problem was the very loud group of kids next door to us - they were telling scary stories loudly and having a blast. After an hour of trying to sleep, really trying, Lillian stood up and said she was ready to go home. We all agreed and headed out from the camp site at around 11. Next time we'll be able to spend the night so long as the rest of the camp sites cooperate.