Another vote for Universal Studios/Islands of Adventure - as per our usual approach, we spent time at both WDW and US/IOA on our last trip in March 2007. At the end of our time at US/IOA our almost 13 and 11 years olds declared that they would be very happy just to come there next time and skip WDW entirely! We stayed onsite at the Hard Rock Hotel and between the hotel, the rides (which are much more geared toward teens) and the front of the line privileges you get when you stay at an onsite hotel, it was a very fun, non-stressful few days. I love WDW and always will want to spend some time during our vacations there, but from now on with the kids at the age they are I think we will now be doing a mix of the two that is more weighted toward US/IOA....