$10 chair rentals on the boardwalk
As Ronald says, there's an area by the aquarium that sells chairs and other beach things, BUT there's a spot right after you go into the beach that rents beach chairs and umbrellas. There's usually a few people stationed near a stack of them that you can talk to. And they help you set up the umbrella too.
I'm there all the time never seen anyone renting chairs
There a small station RIGHT accross from Jenkinson's aquarium. Not sure if they rent or sell however. There may be more locations along the boardwalk.
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