You can also ride up and down Flying Cow to add mileage
There is an exterior track and and interior track that each are around 4-5 miles it is a great bike ride I have seen bobcat and hundreds of birds. Peace full and serene.
The paved trails take a total of about 45 minutes to cover entirely, without missing a linear foot (at casual/moderate pace). Add time to visit the observation tower. The perimeter trail is unpaved, for horses, but you can bike it. Not sure of the mileage, but easily measurable from aerial photo.
Around 4 miles
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