Boiling Billy 4WD treks Close to SydneyThe best 25 4WD treks within a few hours of Sydney are listed and detailed in this guide, whether it is a day trip or a weekend sojourn. This guide is your passport to some of the best picnic, walking, camping, swimming, fishing and four wheel driving destinations on Sydney's doorstep. Treks include: Yengo National Park, Abercrombie Trek, Tianjara Fire Trail, The Bridle Track, Dixons Long Point, Caves to Caves, Watagan Mountains, Sunny Corner Trek,