Pshaw, the link you gave descibes most of the trails i know around my place that im aware of, i.e on the epping / pennant hills side of the park. i had a look on whereis.com.au and there seems to be an entrance on lane cove road, between the M2 and lady game drive, i THINK that may be OK and im sure ive seen it as i drive past, but i dont know if its walking trail or riding trail, or even paved. if your riding the M2 on your roadie maybee scoot on down there and check it out as its not too far.

other than that, if you can get to kissing point road in turramurra which is only a 10 - 15 min drive from delhi road you can hit a big network of trails. im sorry, i just dont know where the trails i ride link up to in there as ive never had a need to look! on the weekend i may hit it up on sunday morning so if you want ill see what the street names are on the exits that i go past.

i havent looked, but MTBR.com may have some advice in their trail guide section. if you get into the pennant hills section there some ripper rock gardens on some of the walking trails that you would love. fair hike on a MTB when you only have an hour tho from delhi road.