Here's the solution. An invisable fence just like for doggies. Trail users purchase their own collar that gives them a shock should they stray across the line. Sounds like the answer
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No ugly fence, no loss of property tax revenue, and the trail costs less to build.
Hey, it works good for dogs so why not people?
Another idea....instead of a five foot, chain link fence...how about those five inch high, granite, rectangular, cobble stones, lined up on the ground without any cement.
A low maintenance, easy to install, almost indestructable, very low profile, landscape fence. Talk about a simple solution.