While driving from FAT would be the easiest, I have found that OAK-SJC-SFO often have much better fares for ~2.5 hr drive (often 50% less). The drive from any of these airports is much more scenic than a trek from LAX.

Hotels are hard to come by in this area. The airport (FAT) has a brand-new Courtyard, with an adjacent Starbucks. Not sure about options in Tulare or Visalia.

However you arrive you will certainly enjoy the Expo! Have a wonderful time in the California's San Joaquin Valley