Make sure you have a reclining beach chair. It's nice for when you want to snooze. The hat for blocking sun is also helpful.
If you're a fair-skinned red head you may want to opt for the full-towel burqa when the sun becomes too intense.
Make sure you have someone to deliver merlot to you when you become parched. If a cabana boy is not available a generous step-uncle is a nice option.
A noodle is good for floating around the river and not too cumbersome to schlep to the beach.
Make sure you have your camera ready for dramatic pre-storm shots of the sky. I'd also have to say a nice roofed golf cart is handy for hightailing it off the beach just before the lightning reaches your side of the river.
Make sure to bring a sense of humor so you can laugh when one of the pictures makes it look like a tiny person is standing on the back of your father's chair so she can pick your head for lice.
And if you don't like my suggestions this is all Diana and I have to say...
Good times...good times...