If you want to hunt for the final Goddess Cube chest, you’ll need to go Inside the Thunderhead, north of Bug Rock. Land on the southern end of the island and burrow inside, exiting to the northwest, to find your Small Quiver.
Anyhow, our next goal is to find a place where we can plant the Life Tree Seedling. How about the Faron Woods?
Go there and land in the Sealed Grounds area, then head into the Temple.