How many times do i have to tell you guys!?
Its in Slate... keep driving till you find the end of Slate. Then jump off the end. You will sooner or later fall in the Golden Block Garden.
Once you fall in the Garden there will be 2 red blocks. If you click the wrong one, you will be banned from Blockland forever! If you click the right one, you get the Golden Block, a picture, and Badspots full trust.