I like Green Valley SP for its lakeside campsites and shower house
It is clear that facilities make a difference. Modern restrooms and showers are always a plus for attracting family campers. My wife does not like the rustic camping when we have our children with us. The modern facilities make it possible to have a good time and Green Valley SP meets expectations.
What I personally like is that at Green Valley SP you can get a nice campsite right by the lake. This makes for great views when the sun is setting and rising. It helps to also feel like you have the park to yourself.
ALSO, DON'T FORGET TO BRING YOUR BICYCLE. There is a nice trail to ride your bike around the lake and through the park. Don't leave your bike at home.