Next to Hale'iwa is Waialua, the old sugar mill town that has survived by moving away from sugar and carving another niche market.
Waialua Estate Coffee is only grown on O'ahu and uses farmlands that once produced sugar. The same company also produces Waialua Estate Chocolate. Their processing facility is located in the old Waialua Sugar Mill. They have a tasting room which you can visit by appointment.
Waialua Soda Works produces gourmet sodas with unique tastes, such as lilikoi, mango and pineapple. Their lightly carbonated, old-fashioned sodas come in a glass bottle are made with pure cane sugar, natural flavors and ingredients from Hawaii (Maui Brand cane sugar, Big Island vanilla, honey from Kauai).
Also in Waialua, next to the rusting mill in the center of town, is the columned, stately, former Bank of Hawai'i building.
Today, Waialua is primarily a residential community, but it's one you'll pass right through if you head west from Haleiwa towards Mokule'ia and Ka'ena Point.
If you're a fan of ABC's hit series Lost, they've done lots of filming on the grounds of the old sugar mill.