Above the seashore hut:
Above trail, next to seashore hut:
At the top of the river, before the first bridge:
[Top] By the fence reachable by mushroom [Bottom] On the coast behind the lighthouse, accessible by ladder/jumping down:
(Another angle of previous picture) [Left] By fence line, get to it by using mushroom. [Right] On coastline behind lighthouse:

Go into the first waterfall and interact with the tombstone, you must have $500 and all 5 bones