Just returned from a 7 day trip with my 14, 12 & 9 year old. Let me tell you, I'm 43 and I ran circles around my oldest 2! They just wanted to sleep. Next trip, I will not plan any early mornings! I went from early morning until late at night, but not those two. I really identify with you and hope you can have a good trip. My 14 year old does enjoy the World Showcase. Have you tried that with her?
				
			
. He says he wants to go back and stay longer 
   I can fully sympathize with you.  As the Mom of a 14yo DD, we have had some "issues" on recent vacations also......It's the absolute pits and soooooo disappointing.  And maddening.  You are NOT alone, trust me.

 and worst 
 trip ever at 15.  We started at DLR with some friends, and my dd was horrible to be with.  We did some touring and needed to spend a night in LA again, and she asked to go back.  So there is hope!  While it was never the great bonding experience, it was an (somewhat) enjoyable trip.
 but if you want to bond, you may have to see her side.