Regarding the map posted up by gaginwood 2 years ago... it appears to still be accurate so far...
I parked at Shanersburg Rd and rode from 1 to 2-total slopfest. It is called the bridal trail and I felt like I was riding through a horse's latrine. Seriously, do yourself a favor and don't bother with this trailhead. Poor drainage and full of nasty puddles. I am pretty sure when I was here several years ago this was designated no bikes, but it has multi-use signs now. This was very slow-going and my bike picked up more mud than ever before (I tried not to think about what was in it). It took a hard 1st gear grind just to pull out of a few of the puddles.
2 to 4 to 5 was a little better, but still lots of muddy spots.
I swung around south, then west on the trail past the golf course property. Now things weren't so sloppy-I went all the way out to the road to see where it came out-right where the power lines run through.
I doubled back and took the unlabeled left, heading north back towards 4. This was singletrack, mostly pretty nice.
Back at 4, I was hearing thunder, so I didn't want to head to 6, 7, 8, etc (also afraid it could be swampy). I also didn't want to ride back down to 1, so I went out to 3. 3 is a gated 4wd rd and the trail there was mostly grassy (and slow). You will know 3 because there is a little place to pull off and park near the gate.
Down the road back to Shanersburg intersection. The thunder was still a bit off so I went to look for the next trailhead on shanersburg (9?) and it is another 4wd road at the start with a gate, but didn't look as grassy as 3.
So that was about it, drizzle was setting in when I got back to the car, probably only got about 7-8 miles and part of that was on the road. Judging by what I saw, I will probably stay away from any swampy areas on that topo. The rotting wet horse manure was just about too much to bear. Maybe a week with no rain would be different, but I'd much rather check out other areas.
Next time out, I'd like to ride from one of the trails near Eagles Mere lake or maybe something further out shanersburg rd. The trails to the far east have me a little intrigued as well, they run along near and through some VERY steep terrain. I'd also like to save time to hit one of the vistas-they are both beautiful.
From what I saw yesterday, I assume the rest of those trails show state forest access roads, snowmobile trails, and only some singletrack, but still worth exploring.
Wish I had more to say. Will post back with any more info I can find.