Bathers - I don't particularly enjoy swimming, but snorkelling at the beach is amazing! Even if I don't get wet I think bathers are that much easier to be wearing when you get all sandy.
Footwear - Thongs of course are most appropriate for the beach, my favourite pair are my love heart Havianas.
Towel - I think a towel is my most important item because I'm not keen on sitting/lying on the sand without something underneath me. This towel is from Honey, Ocean and Earth and I think it is so pretty!
Accessories - A hat is essential in the sun, as well of course is the bag to carry all your stuff in. My bag is from Target and I wrote about it here.
Entertainment - A good book and some music is important while relaxing on the beach. This summer I re-read The Hunger Games and listened to Florence and the Machine!
Beauty - I don't bother with makeup when I'm at the beach but sunscreen is highly important, as well as a moisturising lip balm. I like mine to have a bit of a tint, so most often I use the Nivea Fruity lip balm in Guava.
Those are all my beach bag essentials, perhaps with the inclusion of a drink and a snack. I do spend a week or so at the beach every year on a holiday so I get to pack my beach bag and use it often. What's inside your beach bag?