-( Story related, cannot be missed )-
Sakuya restored you to life, so it's only fitting you try and do the same for her. Kamiki Village, upon your return from the River of the Heavens, is still under the terrible curse and requires you to purify it. When you leave the River and return to Kamiki, the camera will focus on a lone fruit that is born on the Guardian Tree. Cleave its stem connecting it to the tree with Power Slash (Tachigami) and you will restore Kamiki Village to some of its former glory.
Only after that will you realize that there is still more to be done. You will have to head down into the village and talk with the townspeople to see that there are still some problems to be had. Using the map (L2) to survey your surroundings, make your way to the Viewing Platform after having checked out several of the villagers. With some story conversations coming up after that, all you have to do is realize that you are the "Sun Goddess" Amaterasu, therefore you already have what is necessary. Draw a circle in the sky to restore the village completely.