Big Wave Surfing
The main wave to surf on Maui for big waves is at Peahi, regularly called Jaws. This wave is on the north shore of Maui and can only be viewed from private property along the cliffs, from a jet ski out on the water, or from some kind of aircraft (preferably helicopter.) If you get permission to watch from the cliffs, it's best to park at the top and walk down. The road is incredibly muddy and difficult to drive down even with 4x4. Also, make sure to wear shoes you don't mind getting messed up, some kind of hat, water and sunblock. It's a long walk and the sun can crush you.
If you'd like to see some pretty impressive waves at Jaws, we have some incredible photos of Pe'ahi.