In fact, I have been looking at Princess/Celebrity for the cruise, preferring Princess, I think. Seagypsy360, I haven't chosen a cruise yet, although I do want to do the Panama Canal.
I am looking at the 14-day full transit cruises. I've talked to a friend who has done this trip and she says for all the history and seeing the canal and surrounding forests, etc., the full transit it the best. I would be open to mid-March.
I am new to this board, so let me know if you want to contact me. I'm not sure how much in advance I want to book this, either. I see that people are booking very much in advance while others are waiting until a very short time before sailing.