All of this. In regard to camping: across the highway from the State Park are a few campgrounds w really reasonable rates. There's a few spots to camp in the Park itself but I've heard they sell out super quick at the beginning of the season.
The climbing throughout the Park is definitely the best in the area. Tons of bouldering problems all over and some really good top rope routes as well.
Trails are abundant through the entire park and look really suitable for mountain biking, I ride a road bike so unfortunately I can't speak to the quality.
EDIT: you can find the guidebook on Amazon, it's worth it for sure (will save TONS of time looking for climbing areas & problems): Coopers Rock Bouldering Guide (Bouldering Series) https://www.amazon.com/dp/076274281X/ref=cm_sw_r_awd_DybHvb8YHGYVT
If you get the chance and don't mind the drive, check out Cooper's Rock. If you do, be sure to grab the bouldering guidebook.