I am inspired by your acceptance of the need to adapt in a way that allows you to continue enjoying travel. I can't imagine that anyone on your upcoming trip would complain about someone as considerate as yourself and hope that you have a wonderful cruise.
On our Ireland in Depth trip last year, there was a woman who had survived a horrific auto accident & had some walking difficulties, however, she just went at her own pace without asking anyone else to accomodate her needs (except for notifying the program director). At our farewell dinner guess who got a round of applause for her can-do spirit and personal travel style!
Wishing you the very best and "keep on travelin' ",