Generally it is a good thing to make reservations, but there are a lot of places to hold a small birthday party if you forget to make one.
I would reserve that way if it really hot you can get a covered area with a grill if you want, we had a small wedding there it was perfect and there was a water spicket really close to us all so.
There are a lot of good places to hang out. If you have children, you may want to hang out near the play structure and beaches. You can go find an ideal spot for your party. If it turns out to be reserved let, reserve it. Otherwise, just go early.
Just have someone go early and you should be good
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