There are several local companies that you can rent beach gear from. Here are a few our guests have used in the past:

Steger Beach Services (stegerbeachservice.com) rents chairs, umbrellas, cabanas, beach boxes, etc. You can rent daily at the beach entrance itself, or even arrange for longer-term rentals via their website. They also offer setup and take down services of their gear (you do not bring it back and forth to the property with you).

Geared Up Rentals (Geareduprentals.com) is less expensive but do not offer setup. They offer free delivery of gear to the property, and they also rent beach carts for you to transport your gear to/from the beach. They also rent chairs, umbrellas, beach carts, etc, as well as bicycles and linens. 

Linen Ladies (linenladies.com) also offer beach gear and other equipment rentals, including delivery and pick-up from the house.