The only thing that I can add is to be sure to book your travel so you arrive at the ship in plenty of time and, if you decide to go ashore on your own, be sure to allow plenty of time to return to the ship before the scheduled sailing time (as a general rule, the further away from the ship you are going, the more cushion you should allow).
If you and your wife enjoy wines, don't miss the wine tasting (usually held on the afternoon of the first day at sea). There's a charge of $5.00 per person for the wine tasting (and you have to register in advance that morning), but you'll receive a credit of $5.00 toward the purchase of a bottle of any wine from the ship's cellars that you order at the wine tasting (to be served at dinner on the night of your choice). Princess offers an outstanding variety of wines at reasonably competitive prices, so wine affectionados won't lose. At the tasting, they usually sample five wines -- two white wines, two red wines, and a sparkling wine -- on a rotating basis. The head waiters additionally explain the background, etc., of each of the sampled wines during the tasting.
Once you get to the ship, just relax and let the ship's staff take care of everything!