Early period

Hi. So. My period came early. By a week. No big deal. It is what it is. Here’s the issue. I HAVE TO GO TO A WATER PARK ON MONDAY! I already payed for the tickets and have it planned with my family AND friends. So I can’t reschedule. Now I know tampons can be used in the water. But I don’t wanna have to get out of the water and go to the bathroom every other hour. And I have to go to the theme park as well. So heat. Mixed with a period. And cramps. And walking. And rides. Doesn’t sound like a fun time. So, are there any recommendations to make a period stop sooner? Or is that just an urban legend? Pls help! 😩