There's no problem to make the path the right size? =S
Here, I tried remaking your map with the same size, using almost exactly same layout.
In this map, I filled out the trees behind the red house, repositioned the lab and PC to fit better and used more flowers to fill out emptiness.
And like I said, when mapping as a beginner, use the normal tree-style it works a lot better and looks better too, in most cases.