I went hiking last weekend with my two boys and we did the Avon River Walking Trail.
All along the trail are signs saying no dirt bikes.
On the way out in the last few km's the awful noise started and sure enough a few 100m later 2 guys on dirt bikes come roaring along. Luckily we met them at a spot that seemed to branch onto onto an access road and they pulled off the walking trail and stopped as we went past.
We exchanged a polite hello but didn't stop and kept going, observing the usual dug up dirt and tyre marks on the trail until it became rocky again.
I hate dirt bikes. Wanted to abuse the living daylights out of them and punch them in the face (not really but they deserved it)
What do others do in this kind of situation?