Aviation Hall of Fame and Museum of New Jersey

It's small, but has all the models you could ever want. It's great, becausr you could touch almost ecerything and everything. You could climb inside small propeller planes and control them, they have small flight sims and you could explore the the inside of the fuselage if large passenger planes. A definite must-go for any aviation enthusiast.

Small.
Stuffed to the brim with artifacts, like a hundreds plane models. Several aircrafts and old model trucks outside, most accessible for climbing to some degree.
Lots to read and watch (monitors). Several flight simulator games, demonstration contraptions. Some do not work ideally. Those are great for up to ~10 y.o. or so.
May climb in balloon gondola, small plane cabin, etc. Can touch pretty much everything :-)
Some things are exclusive.
Others are forgotten, but worthy attention.
Covers planes, jets, helicopters, zeppelins, balloons, hovercraft, rockets, un-manned crafts, experimental machines, WW2 facts and memorabilia, airport history, satellites, astronauts... We had to go back to cover it all.
They don't even mention this, but there is membership, as $35 for a family for a year - makes sense ONLY if you live nearby: I can not imagine making a second trip just for the museum. But to stop by ($8/$6child/senior) - it's A MUST, I tell you!

There is a library on aviation stuff and old books/magasins sale $1 or 2 for $1.