Checkout the lake and trails at Council Bluff Rec. Area
The campground is pretty good if you like rustic camping. The toilets are pit toilets and there are limited amenities. The campsites are surrounded by woods and has a good feel if you like to pitch your tent in the woods.
The showers are not in the campgrounds, you have to drive to the lake. All of the modern facilities are at the lake. If you have time, hit the 12 mile trail that goes around the lake. Avoid the feral hogs that inhabit the area. I din't see any but they are known to be up there.
You are supposed to have a National Park pass but there was no one there to check them, everything seems to be done on the honor system. You have to pay $3 a day to park your car in the lot if you are going to go backpacking or if you are going to spend the day at the beach.
The beach was beautiful with a large green space and pavilions for a picnic. This campground and park is probably worthy of 3.5 stars.