Look at the map. Imagine you're at home and you want to go to the post office. Which way should you go?
Very complicated to explain. See the map!
Let me try for you:
Take the first road to the right and then the first to the left. Pass at the back of the yellow house and take the first road to the right. When you see the amber house you go to the right, then take the first left. The green house is the post office.