Sorry so long to reply!! Curious how things are going as it has been 3 months.
RE; the cruise, I say go for it, and dont worry too much. The single sided hearing has been my biggest adjustment. But I learn every day about more people who live with single sided hearing -- someone who works for me actually has since he was a child. It makes me rethink what accommodations we have give him.
-walk as much as you can
-avoid noisy venues if you can
-enjoy every minute, because nothing will be perfect!!