If you ride these trails you have probably seen a lot more walkers recently.

Every year Oxfam organise an event called "Trailwalker" for 2000 walkers to raise several million dollars to combat poverty:

http://www.oxfam.org.au/trailwalker/sydney/

This 100km walk this year is on 29-31 August 2008 and goes through the Cascades [Ridge Top, Quarry, Bare Creek & Cascades tracks] and Bantry Bay [near Ararat Reserve]

I was at the Dam today and went over the Bantry Bay. There is now a no bikes sign at the start of the singletrack. It also has a little comment about it being a Aboriginal site.

Is this new? It's been a fair few weeks since I been there.

Unfortunately I still saw plenty of bikes riding out of there who obviously ignored the signs.