We have not sailed NCL for about 15 years and are excited to have planned this sort of last minute trip on the Prima in May. Booking late, I was disappointed that there are restaurants that we cannot get into and the few we could, only very late reservations. I am wondering if once on board, do they open up reservations and if so, how and where do you do it? We frequently sail RCCL and usually you can change or alter reservations the first day once you board. Thanks in advance!