This sounds a lot like something my wife and I did once, at a state park near our home, except there was no waterfall. Terrific day! Thanks for reminding me of it!
As I have been rereading the stories I have written over the years, I have noticed that there are several repeating elements, and I think that can be distracting to someone trying to read a bunch of them at once, so I caution you against doing that. While I enjoy Private Mess...