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Tread Lightly Eco Tours. This eco-minded company operates small-group tours of Blue Mountains National Park and guided day and night walks as well as four-wheel-drive tours and breakfast trips to view wildlife. Half- and full-day walking tours take in such areas as Fern Bower, Blue Gum Forest, and the Ruin Castle, starting at A$145 per person with lunch. 100 Great Western Hwy., Medlow Bath, NSW, 2780. or 0414/976752. www.treadlightly.com.au.