I came to the Blue Mountains on a day trip from Sydney and in hindsight I wish I had more time. Wentworth Falls, a town before more visited Katoomba, is worth the stop. It is a short hike to get to the overlook but the panorama is not to be missed--there's no doubting you're in Australia here. Of course the Three Sisters, the iconic rocky pinnacles of the area, shouldn't be missed either. The hike down to the base of the nearest one is a good way to get perspective on the valley.