If you can only go to one place in the Blue Mountains, forget the Three Sisters, visit Govetts Leap. It is by far the best view in the Blue Mountains. It doesnt matter if its hot, cold or wet you will not be dissapointed. Cliffs, forrests, waterfalls and caves.
If your able bodied, put on some hiking boots and a backpack and take a short or long walk. Dont forget to look up and take in the amazing views when you walk!
I never tire with that view!