I took way too much lotions and potions (shampoo, moisturizer, hair spray, makeup, etc.) on this last cruise and used very little of it.  The automatic shampooer/body wash/lotion in the bathroom is really adequate.

I took too many pairs of shoes especially some that weigh a ton to begin with (platform sandals etc.)

I took way too many "just in case" items (pepto bismol, rubbing alcohol, sea sickness meds, etc.