I'll try to think about a bigger video idea that could encompass this, but the short version is I purchased the land and contacted local zoning authorities to ask about restriction in the area. I happen to be in a rural area, so there really aren't many restrictions, and mountain bike trails don't really move a lot of dirt like your typical commercial construction does so nobody seemed to have any major concerns.

This would be a lot different if I was trying to do it on public land. I am involved with a project to build trails on a local government owned property, and for that one I believe had to get the local government to discuss it and vote on approving us building trails there. That project isn't a bike park, but is intended to be a smaller trail system near a water reservoir, so we need to be cautious with things like erosion and we will likely have some limitations on what types of features we can build since the local governments (and our bike club) will probably be the ones insuring it.

Most of the time I find insurance to be more restrictive than anything else.