Looking for advice or confirmation on the following. So we are to receive a sizeable OBC from our travel agency for our transatlantic cruise. I have been reading that the OBC does not get credited to the acct til we are actually on the ship thus preventing me from using it to book shore excursions. We have the Princess Plus pkg which includes gratuties, wifi, drinks etc. So therefore would want to use the credit for excursions. I just got an email from Princess regarding booking shore excursions which of course I have to prepay and I want to book so I ensure they are not sold out. How can I use this onboard credit towards the shore excursions as I believe I read something about seeing the SE desk when we get onboard. Any advice would be appreciated.