Canceling excursions once aboard??

[DreamCruiser100]

I really want to try and switch around our excursion a little once on board, which I heard is possible if you arrive early, but will it be too late to cancel the ones I have now, I didn't want to take the chance of not being able to book anything, so I have a few second and third choices booked. I read somewhere you MUST cancel an excursion before boarding if you want full credit?? I searched for the answer but couldn't find it.

TIA!!!!

 

[outahere]

You must cancel an excursion 3 days prior to your sail date (not the excursion date) to not be charged. They may let you switch them around once you're on board (without a charge), but I wouldn't count on it.