What to do on the big island of Hawaii?

My older brother is getting married and he lives in hawaii. I have not traveled there since i was young. I am going up there in August. I will be spending a Friday to Monday at Hapuna Beach, and then staying in Hilo at my grandmas from Monday to Wednesday. The wedding is gonna take up all of Saturday, and i Know I... show more My older brother is getting married and he lives in hawaii. I have not traveled there since i was young. I am going up there in August. I will be spending a Friday to Monday at Hapuna Beach, and then staying in Hilo at my grandmas from Monday to Wednesday. The wedding is gonna take up all of Saturday, and i Know I am going to a Luau one of the days, but other than that any other recommendations of things to do while in both areas.
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