909 is good. It's smaller, but the Vassar Farms trails are a lot of fun.
Lake Minnewaska, the Mohonk Preserve, the Steward Airport Buffer Zone - there are a lot of great places to ride around here.
Google the Fats in the Cats cycling club. I do not belong, (all road now), but that's an active area mountain biking club that will have a ton of trail suggestions. You might even want to join up - it's cheap and they have group rides, etc.