I'm with Bill. If you're off the beaten path on crown land, just clear the spot you need for your site. It will be grown in by the end of the summer again. If you're in traveled areas, or by waterways, try and find a clear spot you can use.
What ghost town are you looking for? My dad grew up in a now abandoned town North of Lake Nipigon. We've been planning to go up there for a couple of years now.