My husband (age 38), myself (37), son (8), and two daughters (ages 5 1/2 and almost 3) sailed the Wonder for 3 nights, March 19-22, 2009. Because there were five of us, we sailed in a category 4 cabin, room 8082, on the 8th floor, Aft. Category 4 included a cabin, which was a treat for us.
One unexpected great surprise was that because my youngest child was within 30 days (exactly) of her 3rd birthday and potty-trained, they let us sign her up for the Oceaneer Club for ages 3+ on a trial basis. As long as she didn't have an accident, she would be included in the big-kid activities. This was wonderful for my husband and me, who had a chance to have some adult-only time, and really great for my daughter, who wanted to play in the Club. I think I learned on board that they will take the child on a trial basis if the child is within 90 days of the 3rd birthday and is potty trained. Hurray!
Embarkation was friendly and easy. At check-in, they gave us a "Welcome Aboard" info page that gave information on dining choices, youth activities, where to make reservations for Palo and the spa, and told us not to miss "Adventures Away" at 4:15 at the Goofy Pool.
8082, great location, on the 8th floor, right next to the Aft elevators.