Just returned today from our cruise on Liberty, had a nice time. We went to Belize and Cozumel. Our group had 9 kids all under the age of 10. Here are a few things you'll want to know if you are also bringing young kids.
The kids club daycare/camps are not always open, but rather take a break from 12-2 and 5-7pm. They also don't take the kids out during the day like to the pool, so dropping your child off is a tough choice. It's their vacation too and staying cooped up inside didn't seem fair during the nice weather. What we usually did were short stints during the day but usually didn't take our kids there at all. After dinner, our youngest (4 yrs) was excited to go there (thrilled actually) and we would drop her off and pick up at 10 (really pushing her bedtime, she is usually in bed by 8pm when we are at home).
They were also very rigid about the age cut offs, 5-8 and 9-11. We had two boys in our group who wanted to hang out, but one was 8 and the other 9. There was no flexibility with the staff and I gave up arguing my case.