Jim, we did 2 nights. (I'm still here).
It is soooooooooooo much fun.
I think that it's best to only go for one night for the sanity of the adults. My son could live here for ever but tomorrow I will be ready to leave.
Hotel rooms are great. Food is what you would expect.
This is one of the tube rides...
http://youtu.be/BUwqYce_fY0
Posted from my iPhone/Mobile device