90 mins drive from Sydney takes you to the Blue Mts. National Park. The outstanding walk to do up here is at Wentworth Falls. The National Pass walk takes about 3 hrs to complete and involves an amazing descent down a cliff face next to the main waterfall. The stairs were forged by hand using an Irish mining workforce in the early 1900s. The walk follows a spectacular section of the huge Jamison Valley before climbing back up through the lush rain forested pathway of the Valley of the Waters.