Royal National Park Loop

You used to be able to ride from Waterfall to Heathcoat by going to the right of a fenced off rail yard for 100m or so and then riding along by the trail lines as seen here.

Hadn't done this ride for a while, but today took a look there and that route is no longer possible, so you have to ride the Princes Highway instead (maybe - see below). After that highway section, cross the rail line on the footbridge at Heathcoat station and cut into the park again at the end of Bottle Forest Road.

There's loads of firetrail marked on the map to the West of the Princes Highway, plus plenty of tempting entrances with signs indicating bikes are welcome - this need investigation.