I travelled with my wife and 7 year old daughter. We arrived at the Queen Mary at about 1130am. Lots of people around due to the return of the cruise ship.
Parking was easy in the large parking structure where you drop off luggage. Check in on board the Queen Mary took about 15 minutes. Then the line to embark started. I recommend you get early so that you have less time in line. We were allowed to come aboard at about 1230pm. A few photographers to deal with on the way on but it is worth it if you want to get a decent picture of the family.
We went to the mermaid grill to hang out and get some lunch. Great food with lots of options for everyone.