It's a 3-mile drive through macadamia nut orchards before you reach the visitor center of this factory, where you can learn how the islands’ favorite nut is grown and processed. (It’s best to visit weekdays, when the actual husking, drying, roasting, and candy-making takes place; otherwise, you can watch short videos at each station.) The gift shop—mobbed when tour buses are in the parking lot—offers free samples and predictable souvenirs; a few items, such as Maunaloa chocolate-dipped macadamia nut shortbread, appear to be exclusive.