Yes you can do that
Tl/dr: not explicitly but many people use it as one when the fields are not otherwise in use. There are a lot of people who let their dog run off leash in the soccer fields, but it is not fully enclosed, so you have to trust your dog to come when called/around children since it is next to a playground
Plenty of space to let dog off the leash, depending on the day. Sometimes there's people using soccer field. But the trails would be a great place to let your dog run around.
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