Free you can rent picnic area's also.
Well, it depends on how many people attend and if u need shelter from rain. If it's just the 4 of u I'd say no fee. If it's going to be 25 people u'd be better off reserving a picnic area for the day. Not sure how much it costs, but that way u'll have tables . especially if u have beer etc.
Completly free, but you have to make a reservation
Free
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