It's an open parking lot at the terminal, and from what I've noticed, it's never completely filled so meeting in the parking lot itself is probably the easiest way. You're going to love this, the port is right along I-95 just SOUTH of the Ft. McHenry Tunnel .... I know for Northbound I-95, I look for McComas St (not sure about southbound what the signage says) --- The Port of Baltimore Signage along I-95 is GREAT, you should have no problems..... When is your cruise? My wife and I have one booked to Bermuda later this year. This will also be her first (my third).
Have Fun