When we did that tour in March, 2000 we ate around 11:30(?) at the Columbia Harbour House.
At the start of the tour we got to order 1 of 3 dishes (chicken strips, salad, and the fish basket) at the food was ready and waiting in the upper level of the resturant when we got there.
The menu for the tour has expanded a bit at Columbia Harbour House- we just went in December. I don't remember all the choices, but I know that I got the NE clam chowder in a multi grain bread bowl (not bad for chowder made in Florida!). DH got the fish and french fries basket.
Tip for the tour - before you go, write down some questions you want answered - we had the opportunity to ask virtually any question we wanted while "backstage" and we blew it - we were too tired to think of anything good to ask (our wedding had been the day before!).
Have fun!