What are main tourist attractions of Lancaster County besides driving around and hitting the outlet stores?

Strasburg railroad, PA Train museum, Landis Valley, Ephrata Cloisters, Lititz. These are just a few places off the top of my head.

Dutch Wonderland
American Music Theatre
Wheatland
Rock Ford
Trinity Lutheran Church
National Watch & Clock Museum
Pennsylvania Renaissance Faire
Lancaster Science Factory
Heritage Center Museum
Demuth Museum & Garden
Hans Herr House
Lancaster Quilt & Textile Museum
North Museum of Natural History & Science
Fulton Opera House

You forgot the amish! I had a friend come in to visit from Pittsburgh. We checked out the amish sites on 30E! We ate at Millers Smorgasboard and shopped at the Outhouse - that place was a riot!

If you truly want to see Amish scenery then Rt 30 East is a joke.
Driving around Strasburg, Georgetown, Nickel Mines or north and east of Ephrata will give you more Amish culture and scenery than Rt 30E.