Someone may come up with the specifics you're asking about. But in the meantime, we stayed in the area of blue-colored sites on the campground site map shown on their website, and it was very shady - since it was raining, a bit dark and cool in July - lots of tall trees.
April could be cooler and wet in that area, so you might want something less shady. It is a fairly big place, and those blue sites are a walk from the office, playground and other amenities up in that area. The ones closer to the office seemed to be more in the open.
I had the impression that some of the sites are booked long term, so that rules out some choices automatically if that proves true.
Another factor - You might (or might not with little ones) want to be along the creek and may want 50 amp.
I'd probably call them and talk over your needs if I were you.
