March 2, 2017
There are some really nice trails here, but also a problem. This park is the biggest place around for horse trails, and the horses illegally use the hike/bike trail along the creek, Vondergreen Trail. During wet seasons they posthole the tread making deep puddles, and piss & crap all over. During the dry summer months the tread on Vondergreen holds up better, but then you have to deal with the nettles, since the trail gets no maintenance.
So where are the rideable trails? Park up at the parking lot across from the campground, on Leslie Road. You can start with Pine Ridge Trail, which is on the same side of the road as the parking area, about 50 yards away. This is about a 1/2 mile trail, mostly easy except for the initial climb up the hill. This trail gets minimal maintenance but you should usually be able to pick out the trail.
After that head into the campground entrance and take the paved road to the left down into the pines. The trail that connects up to Dogwood Trail exits from the right side of the road - look for the sign. This leads to a moderately technical trail, with some climbing.
There is a trail junction about 1/2 mile in, at a grove of hemlocks. The left trail leads down about 1/2 mile to the picnic area beside the creek, across from the Mill. The trail is really steep and rocky - not a great ride. But there are new trails being built that connect up with this trail that are good - just not complete as of spring 2017. The trail to the right at the hemlock grove trail junction takes you out on the Dogwood Trail loop, first across the hills, then down alongside the creek, ending with a gnarly creekside rock garden just before the picnic area.
Once at the picnic area head back beside the outhouse to the trail along the tiny brook - this is Salamander Trail. It's a short, but well made technical trail that goes alongside the creek and then cuts back to climb the side of the valley. There the trail heads towards the steep trail that leads down from the hemlock grove trail junction. Follow it uphill till you see the new trail heading back above the Salamander Trail that you just rode. This is a really nice stretch of trail but does not yet connect, so ride it as an out and back, coming back to the steep trail at the end. From there you can head uphill (hike a bike) to the hemlock grove and head back to the parking area.
If you want to ride Vandergreen, don't head into Salamander at the picnic area - instead follow the paved drive out to the road. Go left here a short ways, then turn right to climb up to upper Vondergreen, or go to the right, and go down the left side of the bridge, before crossing the creek, to the lower Vondergreen. This is a 1/4 mile long creekside rock garden, not rideable when the creek is high. From there head downstream alongside the creek, then climbing an extremely eroded old road to trail on the ridge above the creek. Towards the end the trail drops quickly back down to creek level, coming near the water at Gretchen's Lock, then follows the creekside trail down to the group camping area (Sprucevale). I rarely bother with Vondergreen, since it is mostly ruined by the horses.
EDIT: As of August 2017 the new trail connects up. Now at the trail intersection in the hemlock grove, if you turn left there are two trails to choose from, immediately after crossing the tiny brook. The right one is the old short steep trail. The left one is the new trail, and leads downhill to connect up with the top of Salamander Trail.