Thank you to all for the great responses. I really appreciate it. I will definitely have to look into the Spirit cruise as well. If you think of anything else we should know, please share. ANY info is appreciated.
I've heard wonderful things about the Oosterdam. We were on the Westerdam in October and LOVED it. The ship was large, but not huge. It was a good size for wandering around without getting totally lost. We would consider HAL for Mexico if we weren't taking the kids. We have really well behaved children, but I just don't think HAL would be the best fit for them.
AllyGirl, did you like RCCL? What line are you using for your next trip (I see a counter for 4 mths 1 week)? Thanks!