If you like food and wine, you'll have plenty to do! Check the daily Navigators for tastings - wine, liquor, martinis, etc. They also hold mixology classes, where you learn to make variety of cocktails. Also listed in the Navigator will be daily cooking demonstrations by one of the chefs.
For your son, definitely keep an eye on the movie schedule. Disney will show first-run movies on board, and if a movie premiers in theatres while you are sailing, they will "Prem-Ear" it onboard at the same time.
On Tracy Arm day, the temptation will be to hang out on the top deck all day to catch the scenery, but there will be photographers and characters in special costumes on deck 4. We didn't learn that on our sailing until it was too late!
One note of advice - we sailed on the Wonder to Alaska in June, and were very happy we packed mittens and hats. When the ship is moving, there can be quite a wind chill!