If you're a mountain bike junkie, checkout Spirit Mountain!
This is a unique commercial camping experience. I wouldn't normally rank a commercial campground this high, but the activities and things to offer at Spirit Mountain are unique.
The campground is average. It is packed full on the weekends and is pretty windy to the point you might get a little lost or confused when trying to find your campsite. It has amenities and is reasonably clean for the large crowd.
What makes this place great is the numerous downhill bike trails with varying degrees of difficulty. When you get to the bottom ride the ski lift back to the top. It looks like an amazing experience if you are into mountain biking.
There are other activities: miniature golf, a zip line, and alpine coaster, etc. This is a fun weekend for everyone, but bring your pocket book because it's not free.