Calm down. I know how this works.
At the fourth ramp, you have to switch to the bike's slower gear. You won't jump as far. You'll drop right between the ramp and the rock in front of it.
WALK south, then turn east. Go north. Turn west. You'll then need to get on the bike and go fast over another ramp.
Go up the stairs, ride the bike over the balance beam, go down the stairs. Use the bike's fast gear to go up another stairs, cut north, and go up a slick slope.
Go down the stairs. Go up another, and across another balance beam. Use the fast gear to jump over two more ramps.
Go north, then circle around the rocks. Jump west over one more ramp.
Follow the sets of stairs south, and you'll get right to the Earthquake.
Don't say I never do anything for you.