HI!
I am going to go out on a limb and say we camped in section #1 in May of 2016. I distinctly remember Pokagon because it is a gem of a park, with a lot of CCC construction from the 30's that is well cared for. The Toboggan Run, Lodge, and trails are lovely. I am pretty sure our site was #110. That area is pretty hilly, and many of the sites are not level. I am not positive, but larger RV's may have trouble in that area....
Althought pretty hilly, ther is great bicycling here! We were only there for a day, but I would go back there for a week. Probably will be pretty warm in July, but there is swimming in the lake!
Have a blast!