When you first start click start and go to jump to marker location and jump to braap land.
From the RV Head straight to the water, you will see an RV line up with the RV and go as fast as you can to the the rocky pile. There is a small water crossing before the 1st ramp up as you can see in the picture.
Go up the first Ramp, that’s the hard bit, you can press (Y) to save a spawn point if you fall back into the water use (A) to respawn. Now go up ramp 2nd ramp and the bike location will highlight and the bike should be visible at the back of the this ledge.