Yep, you sure can, plus you can sign up for excursions through your TV. Its always a good idea to check your account from time to time, very easy to do and its updated almost instantly when you use your sign/sail card.
Thanks. a another Question is about the 9 hole golf course on deck 13 is do you need to bring your golf clubs onboard or do they hand you one to use on the course? I'm very happy the Mariner of the seas came to the west coast.