I started filling out our online check in for our November 10th cruise on the Fantasy. I initially selected "cash". We can add up to $500 since our cruise is between 6-9 days. Once we start spending money off of it, can we add more before it runs out? I'm new to this whole process. This is my first cruise. If we get to the terminal and decide we want to change to a credit card, we can do this, correct? When do they charge your excursions to your account? I know they do this on your cruise, I'm just want to make sure we have enough money on our card if we decide to stick to cash. Thanks!!