I'd like a part of the ewok village. Seems like a nice place to hang out in.
This wasn't my first thought, but since so many of the rest of you are "dreaming big" ... here goes: one of my all time favorite movie sets, Theoden's hall at Edoras in Rohan.
The entire interior of the Nostromo from Alien.
JD, Pegasus Ponies - I don't understand.