Quad and Moto trails. I only made about half the drescribed loop and still rode 16 miles. Avoid the 'singletrack' trails unless you have some specific beta on a trail - the ones I rode were narrow, rough and pointless, just bascially diversions for motorcycles.
Pros: flowy, nice berms, some short, fun descents, lots of trail mileage.
Cons: corners with abundant loose rock (do you know what 'glacial till' means?) Signage so-so. Climbs can be very loose. Wouldn't want to be on the trails when the motos are on the loose.