I can use my OBC to pay for my excursion but since my wife has no OBC I need to charge the cost. I know once on board I can combine the accounts. I am worried the excursion will fill up.
I think the early risers are no more of a problem than the people who leave the pool with no intention of returning but leave their towels on the chairs. I stayed at a resort in Kauai that issues two pool cards per person and you can get no more towels until you return the ones you have and get your cards back. This might help us know which chairs are open and which ones are still reserved.