Here is a link to a good video on how mountain bike trails can build a community and have a positive effect on local small town economy:
Also some lessons to be learned in terms of un-authorized building. This strikes close for me as I just ran across some un-authorized stunts in the woods.
If you want to build stuff, you need to get involved with your local club who works with the land managers for permission to build.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Good video