NASA Huntsville is where space camp is, It looks like a museum when you drive by, Lots of rockets and a space shuttle (It looks like a real shuttle, it may be a simulated shuttle though but it looks like the real thing) but I have never stopped.

And another thought, I don't know if you have ever stopped at the Welland canal but from the 405 your right on lake Ontario at the very bottom of the canal It's quite a sight to look up the canal and (if your lucky) see a number of ships at various heights in and out of the locks, I think you can see 3 or 4 locks from there. and not out of your way at all.