Hagan stone is a great park! I've been there multiple times for races, and the facilities are excellent and the trails through the woods would have you thinking that you were miles from civilization. If you decide to go for a jog though, be careful not to slip into one of the ponds-- the grass does get very slick, and I've seen it happen a few too many times. In terms of camping, there are quality grass sites and sites for individual tents with a more wooded feel.