The island of Kaua'i in Hawaii has both tours of a chocolate farm (Lydgate Farms) and a coffee plantation (Kaua'i Coffee) with a visitor center. Just gotta find a conference out there, then hop on a Southwest flight.

There's a place in Hamburg called "Chocoversum" that offers a good tour, explaining and demonstrating the whole chocolate making process.

If you ever find yourself in Raleigh, Videri Chocolate offers tours! https://viderichocolatefactory.com/