Luggage and bags:
Dont forget a nice beach bag for your water, snacks, etc. You won't find vendors at many of the quieter beaches.
Clothing/Shoes/Weather Gear: Resort
Camping/Beach/Outdoor Gear: A double sheet from a bed makes a nice beach blanket, is light weight, cool and packs very small. Take one from home for the beach.
Miscellaneous: I could have used a long knife for cutting up Papayas from the market when picnicing at the beach.