There's a Wal-Mart in HHI so you could always pick something up there but personally I would just bring our own if driving. We purchased some really nice Tommy Bahama beach chairs at Costco with a matching SPF umbrella that's pretty large. The chairs are made really well so they will last for trip after trip and the great thing about them was they have backpack straps on them and a couple of storage pockets on the backs. When you go to the beach there's always sooo much "stuff" to schlep. Cooler, chairs, towels, beach blanket, umbrella, snacks....it was super helpful if you don't have a beach cart to have the backpack chairs so you could free up your hands for the other crap. And yes, I would definitely want an umbrella (especially if going in the summer). When we went in August of 2010 it was 95 degrees every day and much too HOT not to have some shade. (There were also a lot of jellyfish so we couldn't stay in the water the whole time.)