You can get good views of Wentworth Falls, in the Upper Blue Mountains, on three excellent circuit walks: via the National Pass, Wentworth Pass (no separate post for this), and via Hippocrene and Vera Falls. But if you want to see the falls in all their glory without much effort, then I can highly recommend the short walk down to Princes Rock Lookout from the Wentworth Falls picnic area.
I had stopped by the Princes Rock Lookout on one other occasion, when the falls were being blown upwards by very strong winds. On this occasion heavy rain had swelled the falls so they were at their most spectacular. There’s nothing else to see on this track except for the views at the end, but it will perhaps take you 30 minutes and is worth this small effort. More info on the NPWS website.
Princes Rock Walking Track: The Scenery
Just pictures of the falls here (plus a video), but there are also good views of the Jamison Valley towards Mount Solitary, and along the Kings Tableland. I included those views in other posts.