globeflyerca,
You can click on
this link and it will take you to the Ticketmaster page you need to use. Once there, just scroll down to the date in question (6/1) and click "Find Tickets". On the page that loads next there is a pop down menu roughly in the center left of the page which defaults to "Best Available" or similar and you just click there and select the specific time you want. I checked just now and it still shows availability. Have a look and see if it is behaving now for you. Good luck. The tour is about an hour and a half so bacck by about 1:30 is my guess. Will be no problem at all to join one of tables.
Bourne,
I think we might just be able to squeeze in anoter couple.

We shall see you dockside.
bowdenj,
See you onboard. Cheesecake factory ain't too shabby that's for sure, but are you sure you wouldn't rather join for a bit of cajun? Either way, we shall see you on the water.
Mike