They are multi- use trails, but yes, there's about 5 miles back there good for the MTB. Not really a destination, more just something to learn a loop on if you are local.
There are a lot of hiking trails, and we have biked then before. It's not a large park for the scope of a mountain bike though and there are a lot of pedestrians on the same trails, so please be considerate of hikers.
Most all the trails are paved, some wide enough for a car. I do not recall dirt trails or paths but did not specifically look for them.
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