OK, so now lets answer the original question: "What is there to do on a cruise?"
The basics are: Eat, sleep, eat, relax, eat, watch the ocean slip by, eat, enjoy some great shows in the theater and the various clubs around the ship, eat, enjoy new friends and finally there is a lot of great food to eat.
Secondly, there are way too many fun things to do on the ship. They have a lot of activities planned -- you'll have to make some hard choices (and rebook another cruise so you can "do it all"). The kids have their clubs and activities that are of interest to most children. For adults (on the 7 night cruises) there are the 3 different "series" that you can participate in. One is the "Art of Entertaining" which has sessions on cooking, wine, table decorating, napkin folding, etc. The second is the "Art of Entertainment" where you will get to meet some of the actors, crew and directors. The third is the "Navigator" Series where you will learn about the making of the Magic and meet with bridge officers in question and answer sessions. There are many different "classes" in each series and you can pick and choose what you want to participate in.
There are classes on animation (how to draw the Disney characters), there is a wine tasting class (extra charge for this), there is a time when you can meet the captain of the ship, there is a movie theater where you can watch movies all day if you wish (you also can watch movies in your room). There are the 3 pools on the ship: kids, families and adults only. Ping Pong and shuffleboard. There is the sports court where you can shoot baskets, shoot puck or play volleyball. There are the loungers on deck 4 where you can sit and relax and just watch the ocean.
In the evenings, the main event is dinner. The food is great, the servers are exellent (usually) and the restaurants are beautiful! Then there are the "cabarette" shows. They are about 30-45 minutes in length and the family show is between the dinner seatings (the adult show is after the late seating). These are the magicians, musicians, jugglers that preform in the variety shows that are on the first and last nights of the 7 night cruises. Then there are the main stage shows. Most are very good. There are the variety type shows and very Disney shows. Later in the evenings the adult nightclubs are hopping with adult games shows, the theme parties and dancing and music.
And the list goes on and on!!