Ringmaster:
Personal opinion: Go on your cruise and enjoy yourself.
Indulge in the way and to the extent that you outlined, which does not sound excessive for a brief cruise.
Newly dx; what is your tx need or status?
I have been consumed by dx and tx for a year now.
If you can relax and enjoy your cruise before you get "stuck in the medical express lane", it might be a nice pre-treatment break.