When we were on Liberty last year, we tried to get a crew member to baby sit our youngest grandaughter for a few hours. The crew volunteer to be used as a baby sitter, and they are paid by the people in the cabin who hire them. We went to the service desk and asked for a crew member, but we had waited too long and non were available. I would go to the service desk upon boarding the ship and letting them know which day/days and times you'd like (in other words, get on top of the list). RCCL has the best "little people" groups, and the kids seems to really enjoy going to them. Good Luck!