A live show like on the movie : Night at the Museum ! It would pack em in !
What would you do to make a museum more interesting to go to? What would you offer to draw in more people?
More touching items ...a meteorite for example is behind glass
I think more interactive displays as "crow" put it. However somethings should be put behind glass/plastic to preserve them.
Houston has some great interactive museums try something to interact with the people