Jasper101!

This is our second cruise on Princess and cruising on the Caribbean Princess on April 7th. We sailed on the Caribbean Princess last time but it was nearly 10 years ago so obviously things have changed! We have sailed on all of the popular cruise lines, some more than others so they are hard to keep them all straight! We have tried to make dinner reservations. We were able to book reservations in the MDR (although later than we would prefer) and the Crown Grill but unable to book at Sabatini's. The Crown Grill has openings every night but Sabatini's does not-maybe a glitch? Just curious if they hold reservations for when you board or are we out of luck? As well, what are the chances of changing MDR reservations, we prefer a private table so we reserved it but also don't mind grabbing a pager and a drink while we wait. I have read that there is an adult area called the Sanctuary-is this even offered on this ship and if so can you pre-book? We checked in today, when do they assign a boarding time? Appreciate all the knowledge on these boards, thanks!