This is one of our favorite state parks in Indiana. There are lots of trails to choose from, lots of places to picnic, a small nature center, an inn and camping. It was $7 per car to get into the park with Indiana license plates. At the main gate they also had a posting of the activities for the day such as guided hikes, a program about bats and more.
We camped this past weekend in the non-electric section. While we had a nice shady spot about half of the spots have little to no shade which can be brutal in the heat. When you reserve your campsites online it will give you an idea of how much shade to expect. Restrooms were clean and modern at the campground. At the gate to get into the campground you can purchase firewood ($6) and bags of ice ($2).
The outdoor pool was really nice and was a good size. Even on a hot day it was busy but didn't feel crowded. It was $3 for each person with kids under 2 admitted free. They also have a small concession stand that sold ice cream, nachos, French fries, hot dogs, etc. The nachos ($3) weren't anything special but the kids needed a snack. The kids loved the water slide. Smaller kids could ride down with an adult if they had a life jacket on. One word of warning was that there was only a couple of umbrellas for shade mostly in the snack area. I spoke to a life guard who allowed me to use an extra umbrella to help shade my toddler. Pool is a must for hot days.