Coffee
When you goto Hilo,
the best coffee, my wife's opinion, is the Kona Coffee and Tea company. They are located about 10 mins south of the airport- on the main road. Also have a website. 100% kona coffee, and the best tea available on the island. !
Mama's House- on the big island. If you fly there, get Air Services to make the reservation, and make sure you bring the Credit card. VERY PRICEY, but worth every penny. Of course, don't forget the Mai Tai's at Air Services!
Yummy.
Maui is very nice- lots to explore- If you really want to have a fun approach, head over to Lanai City airport. Sits on a 1,000 ft cliff. Really cool!