The two main meals you do not want to miss in the main dining rom are the two formal nights. The first formal night will definitey be on Monday (St. Thomas day) and then the last one will most likely be Friday (Barbados), but there is a possibility that the second formal night would be Thursday. If you avoid those three nights you will be fine. Of course, when you get onboard there will be a cruise highlights info sheet in your stateroom and it will specify which nights are formal, semi-formal and casual along with the special events scheduled for each night.
We would be OK with skipping the lobster/seafood night since neither of us like seafood. Do you know when that is? Also, if they have any kind of strange "Italian" night like they had on Princess (rabbit, seafood...), we would be OK skipping that too.
Star Princess - December 2006
Adventure of the Seas - April 2005
Caribbean Princess - July 2004
Golden Princess - March 2003
Disney Magic - October 1998
The lobster/shrimp combo is usually served on the second formal night. However, they also serve a nice beef selection on lobster night. There are no "strange Italian fare" meals. Actually the pastas on board RC I found quite good and I am a pretty basic meat and potatoes gal.
Oops, I forgot to mention that my experience has been that whatever night is the Country and Western theme night is the best meal to skip. It always seems to offer the weakest and less desirable meal of the cruise (at least to my liking).
Yes, they do offer a steak but it was not a quality cut of meat as our most of the other beef choices during the week. (Actually you can order steak every night as an always available alternative choice). I should mention that in speaking with the hotel manager, the menus are under revision and what may have been true on my cruise, may not be the menu they will be using when you cruise. They always post the menus for the day outside the dining room in the morning. You can always check it out and make your decision about where to dine based on the selections for the day.