At the main field, if your facing the water there a hut on the sand to your left.
I believe they all should have
In front of West bath house
I'm sure Fields 4 & 6 have umbrella huts on the sand, not sure about the others. Also, the gift shop at Field 4 has umbrellas for sale.
Field 5, it's the main field places to eat, great place to enjoy a great beach day with your family
Field 4, field 6, field 5, and field 2 all have umbrella stalls for rentals.
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