From Lana'i City head towards the airport, pass the airport and keep heading towards the harbor. Take left onto dirt road at Kaunolu sign. About a mile down the road turn right at the King Kamehameha sign and follow until you hit the ocean. There is a lot to park in and a trail that will cross through the valley down below and right to the jump. You will need 4wd or at least a vehicle with some clearance, the road is very rough.