I was there on a day that it was raining and had been raining for quite a while. I just meant that the water through the gorge was not fully staying within the banks, and made for some impressive drama. I did a quick ride by as I'm planning on going back tomorrow. There are two walking loops along the edge of the gorge that are not bike-friendly. There's a very narrow suspension bridge for pedestrians only that you should probably do for the best view of the gorge and the larger waterfall. Apparently there's also dango that gets sent across the gorge on a rope? A friend told me to be sure to have some, but I was there after hours today so that's on the plan for tomorrow.