My friend invited me to go on vacation with her to a lake. They're renting a boat so we're gonna be tubing, jet skiing, water skiing, etc, and of course swimming. We're going for 5 days, and I'm supposed to get my period the second day we're there! I want to participate in all the activities. I've worn tampons a couple times, but I've never gone swimming while on my period. What should I do?!