The family took our first Disney Cruise this year, which was fantastic! Here's a great cut-away graphic of the Disney Wonder, but the other ship, the Disney Magic is almost identical. This graphic is a little out of date, because some things have changed. The ESPN Skybox is now a teen area called The Stack or Aloft depending on which ship you're on.
The ship is actually quite large, so the spacial representation of locations is really helpful. You can get turned around very easily.