Head south from Clock Town until a scene occurs with Tatl. In the next area shoot down Tingle and purchase the Map of Woodfall , the Map of Snowhead can be purchased now if you have expendable Rupees.
Piece of Heart #11
The tree that you passed to reach Tingle has a Piece of Heart atop it. Put on the Deku Mask and blast the Bad Bats that impede your progress up the vines then climb to the top of the tree to claim your reward.
Swamp Shooting Gallery & Fishing Hole
You’ll be coming back to this later, just remember that it’s on the east side of this zone.