First, talk to your primary care physician or the nephrologist who evaluated you on your path to donation. Mine has always welcomed hearing from me and responding to my questions even though I was only briefly her patient 13 years ago.
I understand your desire for a positive recommendation, but there are just too many products out there, each being reformulated all the time. I found a more complete prescribing guide discussion at
http://www.patient.co.uk/doctor/drug-prescribing-in-renal-impairment, but unless you've been tested and are demonstrating impairment in the ranges listed in the article, I'd take a more relaxed approach to this. The greatest danger to everyone, not just we kidney donors, in taking multiple agents for multiple symptom relief is that so many products contain acetaminophen one can overdose without realizing it. That's liver toxicity, not kidney.
Occasional use of NSAIDs, in moderation, monitoring your response, shouldn't be a problem. Last, talk to your PCP or nephrologist about your concerns generally, and specifically about the combination you're contemplating in an isolated environment with greater than routine environmental challenges. Best wishes that you feel better soon, that you get satisfying answers, and that you have a great time on your cruise!
PS: Friends have recently recommended taking a cruise, something I hadn't thought of as a desirable vacation before. What's your route? For how long? What line? How did you decide? Thanks!