A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,012
On a weekday, I would do Air & Space without question.
On a weekend, I would do a series of smaller museums and hit all of the outdoor stuff. Air & Space gets VERY crowded to the point where it's almost hard to walk around.