There is not much in the way of hiking and biking trails in the RV parks, so if this is your thing you will be disappointed. There are many Corp of Engineer day parks that have plenty of hiking trails.
One thing to keep in mind at the Corp's RV parks is the gate closes at 10:30 pm and opens at 7:00 am. You literally cannot get in or out (with a vehicle) during this time. You have to call an emergency number that's somewhere in your rules and posted at the entrance.
If you ask me, this is a lawsuit waiting to happen. Why not a key code access?
Also, when leaving Old Federal, be very careful. The entrance and exit is very narrow. The gate house is in the middle and has an overhang. I know because I caught it with the corner of the camper. Now, I have to attempt my first roof repair. By the way, I am not the only stupid camper! From the looks of the overhang, it's been hit many many times.
It's great that the lake and Corp of Engineer Parks are close to our home, but because we are more into hiking and biking, we will probably stick to the quieter state parks.