The WB Studio Tour, for sure! You see lots of cool stuff from tons of different movies and shows, but most importantly you see the outsides of Lois and Clark's apartments and a bunch of other sets commonly used on the show.
I don't think they usually point out stuff from LnC so much anymore, but you can tell your guide it's what you're interested in and they should be able to help you out. Some of it is pretty easy to spot on your own, though.
