Regent is in the process of changing the way excursions are booked.  At the moment, I cannot find the date when OBC's rather than credit cards can be used but it is between now and November, 2019 (I know - not much help).   Currently, it is not that difficult to get reimbursed for excursions that were booked to your credit card.  You pay for them in advance and then, one on board,  go to Destination Services where they will cancel your current booking and rebook using OBC's.  The amoun