I have not read any of this thread, but my guests mostly used the following:
Flip Flops, all the women used them
Pashmina - some wore them as swimsuit wraps and others at night, but I say all the women use them.
Water bottles - got used by most people
Body Spray - men and women loved it and used it
Beach bags, they all used the bags on the beach
I am not sure about the soaps and razors and stuff because I did not see them use those
Tylenol, everyone told me they used that
Lip Balm, only gave to women, they loved it
T-shirts, only gave to men and they all wore them at least once
If I think of anything else, I will let you know.