Find the three Minecraft style blocks hidden in the "Goat City Bay" map.

Grass block: Go to the blue concrete half-pipe in the city. Notice that there are two hills that overlook the skate park. One leads to the wind altar for "The Savage" achievement and UFO. The other hill leads to the grass block. If you are staring up at the hills, follow the one to the right. At the top of that hill are three boulders of death. Follow the bottom of the cliff to the right visually to see an abnormally bright green grass block hovering and rotating. Run over it to pick it up. Note: If you start at the middle of the half-pipe, you can run straight through the goal leading up the hill and get very close to it (Screenshot 3).
Wood plank block: Go towards the parking lot at the carnival. To the left should be a time trial icon hovering over a barrel on the ground. Follow the nearby dirt path. You will eventually find an alcove with a speed boat to your left and a tree to the right. The block is in a dirt patch behind the tree, closer to the rocks (Screenshot 1).
Cobblestone block: Go to the cemetery behind the three windmills. You can either take the dirt path down to the cemetery, or jump off the cliff behind the windmills. The cobblestone block is located closer to the base of the cliff near the windmill (Screenshot 2).