Can you go swimming during your period(without a tampon)?

I just got invited to the Nick Hotel (a hotel/ waterpark) and of course right when I’m supposed to go is when I’m due for my period. I’m too young to wear tampons, and I don’t want to ruin my bathing suit or be embarrassed in front of all those people. I also don’t want to disappoint my friends by not going because I’m pretty sure they already made reservations and to tell them now would be just mean. Can I go swimming with a pad? Is it true your period stops while you’re in the water? Any other ways to not leak in the water you know of?

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