We drove from Austin to Gulf Shores last year. Stopped at Bass Pro Shops near Baton Rouge both ways which was a hit with our toddler, we also made stops at sporting goods stores, Chick-fil-A, Buc-ees, etc. it was a lot slower than our usual pace, but we made it .
Also thought about stopping at the aquariums in Biloxi or New Orleans, but our timing of getting to those places didn’t sync with nap time so we skipped them