I have to have...
If I go to Epcot during September, I <i>must</i> have the "Chiles en Nogada" at the San Angel Inn.
"Chiles en Nogada" is stuffed poblano chiles with walnut sauce, and my absolute favorite dish of any Walt Disney World restaurant. It's served at the San Angel Inn Restaurant during September as a "Chef's Special" ( under $20) when the walnuts are newly picked and the pomegranates are in season.
As for "suvvies", I try and pick up one nice quality, oftimes price-y item that one can only buy at the parks ( but, of course, there's always Disney mail-order, in which case one can get almost anything from practically anywhere).
Most of my souvenirs have been items from Disneyana Conventions, but I do manage to get a least one t-shirt, a pressed quarter, and a few pins.
Oh! And adult male clothing that isn't t-shirts and pajamas. I need pants!
"Pants"! ( get the yolk?)