Hi Andy.
Not sure if you've been updated, but Springfield just completed the Abraham Lincoln Museum and Library. While I haven't been yet, (I guess it's just too close) I haven't heard one negative thing yet. The place is suppose to be spectacular. I've heard "Disney has nothing on that museum" amongst other things. All of the Lincoln related stuff should keep you busy for a while. The entire museum area has been upgraded and is pretty neat. The kids should like this also.They just completed a refurbished train station, (union station) across the street a few weeks ago. In the same area is the old state capitol where Lincoln gave a famous speech or two. Also Lincoln's home, Lincoln's tomb...well you get the picture.
The route 66 stuff doesn't do much for me, but I guess it de pends on what your interests are.
Any other questions, email me! John C.