1- Grill.
2- Charcoal.
3- Charcoal Oil or small white cubes lighters.
4- Matches.
5- Skewers or anything to use to BBQ.
6- Something to catch the Coal and place into different places.
7- Coleman and fill it with ice for soft drinks and water.
8- Soft drinks an water.
9- Beach chairs.
10- If you got disposable table.
11- Big Carpet or Rug.
12- Water to rinse yourself after swimming.
13- Plastic bags to keep anything there later [big ones for garbage, small ones to keep your wt clothes inside later].
14- Sunblock if you are going in day.
15- Beach Umbrella if you got no tent.
16- Disposable cups and plates.
17- Food to BBQ.
18- Bread, Cheese, Sauces and Vegetables and maybe fruits.
19- Big plastic bags [black ones] so you can fix it on your car seats so it won't get wet later.
20- Slippers.
21- Beach Volleyball, Floaters or anything that you might use in any activities later.
22- Fishing Gear if you intend to catch fish and a separate Coleman to keep the fishing bait and the fish there.

Hmmmmmm? What else? I can't think of anything anymore ...

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)