If you're a drinker, then a package might be worthwhile. Look at Princess Plus. We find it to be a good value. Includes 15 alcoholic beverages up to $15 (you pay the difference if the drink is over that), wifi, and tips. With a suite, you do get a mini-bar setup. A few beers, a few sodas, 6 or 8 mini-bottles of liquor. You can swap out for things you line - alcohol for alcohol, soda for soda...
The best tip is to be sure to take advantage of the Suite Breakfast in either the Crown Grill or Sabatinis - it depends on the ship. A Relaxed, pampered breakfast is a nice way to start the day. Can't go wrong with starting the day with mimosas!
Also get a complementary specialty dining the first night. You need to wait until you board to reserve it. If you do it before hand, you'll need to pay upfront and then get refunded once on board.
There's a lounge that the setup in the evening for Suite, and well traveled guests. Nothing special.
Most folks seem to dislike the canapes.