Harvest Goddess

Throw a vegetable into the waterfall that's by the mine that's open all year long. If you do so, the Goddess will appear! Once you've given her a certain amount of vegetables, she will do something for you...

5 vegetables: She'll give you a Power Berry.

10 vegetables: The guy who likes you the most will come down from the flower field in the mountain with a flower for you. If it's Kai who likes you the most, be sure to get this scene in the summer!

15 vegetables: The Goddess will give you a piece of lumber that Gotz will buy from you for 1000G.