OK, take I-20 out of Big D to Shreveport. In Shreveport, take I-49 south. Exit I-49 at HWY 190 (Opelousas exit) and go toward Baton Rouge. Here is the tricky part...as you are getting near Baton Rouge, you will take HWY 415 (poorly marked, look for a 'to I-10' sign) north to I-10. Be on the lookout for the 415 sign after you pass Camille's Restaurant. You should NOT cross the Mississippi on HWY 190;if you do, U-turn and go find 415. Hwy 415 hits I-10, go on I-10 east until you hit I-12;go on I-12 and bypass New Orleans;you will pick up I-10 again in Slidell, Louisiana. I-10 brings you to SOWAL...pick your favorite entry point into Walton, I like HWY 331, but some say exit 56 to the Mid-Bay Bridge is better. Remember, no speeding through Krotz Springs, LA (but you can stop at Billy's for boudin). Good luck