I heard about Quarry Park in a Courant article and somewhere else. This former hill, a rocky one, is where Rocky Hill got its name. The article describes the park in far more purplish prose than I would, both because I was looking for single track (not a newspaper column) and because it felt more like an abandoned quarry than a park, which isn't really that scenic. There's a little bit in the way of single track and it's a really quick ride through old Wethersfield from my house to get there. The single track is ok and there's about a mile of it, so I definitely wouldn't drive a great distance to get to it. In fact, I wouldn't drive at all. Maybe if you're passing by on a bike, stop in.