I was forced to haunt the backyard last year because we were finishing our basement and stuff was in the garage. I put a few pics of it up on my website, but I only got half way through the haunt and the pictures are very high quality so they take awhile to load. Here's the link: http://theterrorhauntedhouse.yolasite.com/pictures.php
I started building in early August. I ended up having paths leading from room to room. We actually got a massive snowstorm a few days before Halloween. The 30th was spent shoveling snow for paths- all day. But the snow helped make a nice natural barrier in our courtyard.
What is your budget like?