Is this just a question for how much to tip or for port days?
For port days, if we are on our own, we usually do $100 per island plus the credit card as you never know. If we do a non ship excursion, 50% of the time it's cash only so we also include a 20% tip of whatever the excursion was since the gratuities are not included. Those days I also bring $100 on top of the budgeted tour.