Also if you play this game all the time, running everywhere, your town could eventually become a desert, which means you no longer have grass. Your grass slowly gets destroyed. If you create paths, then you have main routes to run on, meaning you WALK everywhere else. (saving your town from desertification)
I don't have a desert, here is a link of a town that is almost a desert, but there apparently is still some grass (i couldn't find a picture of a town that had a full desert and I don't plan on destroying mine just for a picture) -
Step 1: Designing your paths
So I would hope that you would know this by now, but you click on the pencil on the bottom of your screen, click on one of your patterns, select Edit Design, then design your pattern.
I prefer to have street patterns or different colored checkered designs for my pattern paths. I don't like streets though, because you can't make diagonal roads.
Tip: DO NOT use stripes, because they give you headaches while playing.