It's nice of you to remind us that we are so smart, and that Canon scientists are so specialized, that we can determine not only what lens is best for a beach -- as, I guess, compared to a park or a backyard or a mountain valley.
East coast beaches require small-glass lenses, until noon. A small glass lens, accompanied by a lens hood, permits flare minimization while placing water in the backgrtound of a photograph.
Therefore, a lens such as the 17-55 mm zoom with a 77 mm front filter will not permit photography befor about noon, when the sun should be straight above.
For morning pictures you'll need a 35mm f2 and a 50mm f1.8 lens, both with lens hoods. And you will need flash fill or a big reflector in order to place the water int he background.
Note that if you go to a beach in a bay, circumstances wll change and it may be necessary to us west coast beach lenses.
BAK
BAK