Ladies! I'm going on a cruise this Friday and I'm going to be on my period. Anything to help it come early?

This Cruise is to the Bahamas and I really want to be worry free from my period. I wouldn't mind using tampons but I'm a pad type of gal so i don't really use them. But for this trip it's going to mandatory for me to use tampons. If I were to start it today when i get on the ship it will be my fourth day. Normally I have my period for 4-5 days. So I have heard of green tea, vitamin C, and parsley tea. But i already have the green tea, and vitamin C tablets. Any suggestions on what to do? Or does nothing really work? Thank you all for your answers:)