Hi John
When you come down take I-255 South until you get into MO and take the Lindbergh exit about 1. 5-2 miles into MO. You will see the Buffet on the right as you get off the highway. You will have to work your way back from a side road. I don't remember the name of the road you can turn on, but it is easy to locate. If you don't see the Buffet building, look for Home Depot, the buffet is next to Home Depot.
I hope this helps!
There is no South exit for Lindbergh, so you can't turn the wrong way. Lindbergh ends at I-255.