A good tip I learned last trip: ask the CM to put clear scotch tape over where they write. I had a birthday button and I guess my sunscreen rubbed off on it, because the first full day I looked at the inside of my bicep and it was black! I thought I had gotten hurt somehow until my boyfriend pointed to my button which was totally smeared since I had on a sleeveless shirt. When I randomly mentioned it that night, the girl at the general store on the Boardwalk grabbed one for me (didn't know they had them!) and put the tape on it and it worked great! You couldn't even tell there was tape over it and it looked awesome, and no black-smudged arms!