Hello neighbor. We're in extreme northeast Thornton so the post office keeps thinking our city is Brighton.
We'll be on an Eastern on the Fantasy in June 2012 as well - but ours is the first one that month whereas you'll be going later in the month.
Anyway, here are some other differences between the 4 and 7 nights (we've done two of each).
As PP's have said, you keep repeating the same rotation. That's a little different than the 4 night where you repeat one night. For example, a typical 4 night is PTTA. A 7-night might be more like PTAPTAP. You will get the 3 regular meals and Pirate NIght menu, as well as meals like Captain's Gala (i.e. lobster night), the Till We Meet Again Menu and another feature menu. What's different is that all three restaurants have the exact same menu on those nights so lobster night could be in AP, Lumiere's or Parrot Cay. That's different than the regular menu nights where each one serves a different menu than the other restaurants.
Also, the 7-nights have true formal nights and semi-formal nights instead of a "Dress up" night. Honestly, it's not that different except the menu itself is unique and more people seem to dress up on the longer cruises.
The 7-nights will have more matinees on Sea Days. I didn't see a matinee of the evening show on the 4-night. The evenings also have some variety acts and different feature shows. We've seen magicians and comedians on the 7-night cruises in addition to the more traditional
DCL shows.
YOu will also get a character breakfast one morning similar to Chef Mickeys - it's held at Parrot Cay.
The 7-nights are practically twice as long as the 4-nights (6 full days vs 3 full days). You get more time to relax and the ports are better than Nassau!
I like the 7-nights much better as the ship actually goes somewhere. The 4-night is just a very slow moving circle. (Imagine a big circle up to Nebraksa down to western KS and back to Denver. Instead of prairie, it's water.) The ship actually travels quite a distance on the 7-night cruises and the Sea Days are needed for travel instead of just slowing down for a crawl back to PC.
Enjoy your 7-night cruise. You won't want to go back to shorter ones afterwards!!
PS - Is your avatar picture your DS doing some mutton busting?