The Sky is great! The cabins are small so be aware that storage space is tight to say the least. I sailed the Norwegian Wind to Alaska in May and security in Vancouver was extremely tight. Since the Sky departs Seattle, I don't hink it will be a problem.
As a normal course of events, I would suggest you get there a night early to enjoy the departure port and to be sure you are at the ship when it begins to board, after all you paid for it why not enjoy it?