This was a book of Hawaiian legends produced in the 1920s. The stories focus mainly on one of the main rivers--the Wailuku, of course--and the goddesses, gods and demi-gods who live along its length.
The stories are very well-told and interesting. I especially enjoyed the way they referred to things and places that existed in the modern (well, 1920s) world as well; like how there was a spring that bubbled up where there is now a boarding school. It gave the stories a very strong sense of Place, and a sense of Time as well (like you could have shown up 20 years earlier and seen the spring rather than the school). I think I've seen something similar in other books of tales and legends, but it's never come across as well.