The vast majority of the people who kayak the Wailua River are there to hike to the least-secret Secret Falls we know. Being ourselves, we couldn’t limit our activities to the things on the beaten path.
We don’t know who put up the rope swing, but we’ll bet it wasn’t a tourist. Tourists just don’t carry around enough rope. Nor are they very motivated to leave behind something fun for the next person.
The locals come up to this spot to find relief from the heat on a hot day. We did the same and it was a wonderful moment.