At camp, sunscreen will become gold. The 25 SPF stuff they give out is shit. Bring at least one full bottle of a good, NON-SPRAY sunscreen, depending on your trade (eg, bandies who are inside more than bosns will use much less), if you are out on the water, length of camp, ect. Bring it with you almost everywhere in your bag.
IF BOSN: APPLY APPLY APPLY! It doesn't matter if you tan/burn or not, you still should apply it every two hours minnimum, especially if you are on the water. Water tan consists of: Horrible crew-neck t-shirt tan/burn, RED legs from bottom of shorts to knees, (About 5-3 inch slice of skin on top of thighs), knees and down is lighter burn/tan, and then the oh-so lovely shoe tan.
I still, from last summer, have traces of that tan. Not fun.