Is there a lot of uphill and downhill walking to see the waterfalls. I have bad knees and can only can’t walk uphill.

There is no way of avoiding the hills on the trails, but as Ray mentioned, there are different trail types. You could try the easy trail and use a walking stick or take breaks to help with any uphill difficulty.

If you stay on the trail, there are easy, medium and difficult trail selections. There would still be some up and down some smaller inclines.