Hi Sid: I'm not a CruiseMates Staffer, nor do I play one on T.V., but I did stay at a Holiday Inn Express last night, and I know the answer to this one.
(Actually, we book GTY a LOT!)
If you don't have your cabin number before heading out to the port, all you need do is ask the porter, when you drop your checked baggage to look up your cabin number, and place the correct tags on your bags. (Actually, you can do this anyway, if you forgot to print, or you just don't like the "new" luggage tags.) The porters have a list of all the passengers, and what cabin they're assigned to, and they have luggage tags that they can place on all your checked baggage.
This doesn't happen often with a GTY, but occasionally it does, and that is the solution.
Have a GREAT cruise!
Forgot to mention. Ordinarily the cabin will be assigned right after final payment is made. It can be assigned anytime between then, and embarkation. We always just check the Carnival Web Page.
A lot of the time, you will know your cabin assignment before your cruise and if enough time, they mail them along with your docs, unless everything is e-docs. Just ask at the pier if you do not receive luggage tags, they will take care of you.
Hey Sid one last thing, when ever I have to use the luggage tags at the port, I hate standing there writing everything out, so instead I carry return address labels, like the ones I stick on envelopes when I pay the bills. Then all I have to write on the tags are my phone number and room number. It saves a lot of time.