Hello, I have never been on a cruise but I was on a honeymoon last year and I was so stressed about it because of the long flight and worried about what to eat. I ate snacks of crackers and pretzels and brought some peppermint tea bags on to the plane and just basically avoided any remote possibitity of stomach problems. The resort we stayed at had a buffet for most meals and it was so nice to be able to pick exactly what I was going to eat. I did not have one stomach problem the whole week. I think eating often throughout the day helped out a lot. Plus I remember just doing excersions only when we felt like it and we took time to just relax. I swear I look at my Aruba pictures and I think what a good stomach week that was for me! ha ha. Good luck and I hope you have a great vacation. It's snowing here in Cleveland and I'm feeling jealous!
PS. I also just started the Acacia and have had great results with the IBS-D. I'm trying to drink as much water as I can thoughout the day now that I'm taking the fiber and although I have to pee A LOT my stomach is feeling great.