Be prepared to satisfy your sweet tooth.
Tons of asian snacks and candies, from shrimp chips to hamburger gummies. I think you can get those fabled green tea kit-kat bars here too.
Large selection of dried fruits and other random Asian dried goods in jars in the middle. Buy in bulk and bring it home for your grandmomma. Just play it cool when you get to border patrol and they ask if you have anything to declare ;)