For the few hours that most have before the shop sails, investigation, is the norm, I think...first and foremost eating lunch, then if you are are able to get in your cabin, frop off your carry ons....
Check out the dining room, see where your table is located,so, if it's not to your liking, for whatever reason, you can check with the maitr' d, to se about being moved.
Make spa, or salon appointments. If you are a wine drinker, check out the table set up, with selections, and wine packages available.
Hit the pool, relax, and, wait for the sail away party