If it is hot then wear shorts, maybe a swim suit if there is a creek or pond. Just regular shirts that you would wear. DEFINITELY bug spray, mosquito bites are horrid so just bring OFF-example. Tennis shoes or something rubber that would help you climb and not slip in case because flip flops, stuff will get into your feet. and a flash light when it is dark. You should be just fine with these things.
"they have an RV thing."
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That's not camping. All you'd need is a change of clothes. When you *do* decide to *really* go camping, ask again.