Nick,
I am a "Non OHV" guy and I always will be!! That being said, partnering with the OHV community is key here. As an example, a buddy of mine is the Parks Planner for Canmore and when the community and Land owners complained about an illegal mt. bike course (those kids sure put up a beautiful course), the first thing he did when he (they) proposed that the town build a course up at the nordic centre was get the kids involved that built the illegal course and they were key in designing the new (and legal) one, and since they actually had input and felt that they were part of the process, it worked out very well!! Same thing happened here with Millennium Park with the skateboards, they helped plan and design the park. Those bureaucrats like those sorts or partnerships & win-win scenarios!!
Cheers!
P