Honestly, I don’t visit waterfalls twice very often; there are a few local waterfalls that I’ve visited more than once, but most locations I take photos of and then move onward to the next spot where the water and the land had a disagreement.
Rainbow Falls’ east vantage point is spectacular; you stand on an outcrop of land about six or eight meters above the downstream portion and roughly eye level with the upstream portion. The Black River has carved two paths down the falls, equally treacherous, and from that vantage point, you really need a wide angle lens to capture the scene and stream. If you walk a bit further south on the trail, you can see where the Black River is slowly carving out a new falls and a new path.
If you visit Bond Falls and you only view it from downstream it can be a little … boring? But, if you take the time to climb up beside the falls on either side (don’t worry, the falls has concrete barriers to hold the water in), you’re greeted by these beautiful vignettes. Viewing the entire falls is … just a bunch of water flowing over a hillside, but walking along the side or even walking downstream will bring you closer to nature and the forest.