Life rafts only have room for people. Extra layer of clothes and fill your pockets would be my plan.
I'm with BoatMan. Consider a
1st line/2nd line/3rd line approach to your gear.
A cruise ship is a big, complex 3D maze where you have likely never been before. What are the odds that if something major-league bad happens, you will be in your room or close enough to it to have timely access to your emergency bag? Will you be able to wade through the panicked passengers to get there? We hope so, of course, but in addition to (reasonably) filled pockets I think you and your companion should seriously consider wearing a waistpack/fannypack with the most compact essentials like your PLB/satphone, knife, passport, a few days of critical medications, etc. That way if you can't access the emergency bag you at least have some critical essentials. If you can access the bag then that's gravy. Wherever you go on ship wear your hat and keep your sunglasses on you (preferably on a neck cord), along with a light jacket.
And whatever you do, do not I repeat DO NOT
watch this movie before you go!
INTEL/RECOMMENDATIONS:
DO NOT get too familiar with crew members, maintain an invisible wall between you.
Can you elaborate on this? I don't get it.