Target a keese with the gale boomerang to bring it to Link. Turn into a wolf and use a Dark Energy Attack to target the keese. Wait until it returns to its platform and release the attack to jump up to the platform. Then use a Long Jump Attack to reach the Heart Piece.
Alternatively for the Wii, you can use a super jump in place of a long jump to get to the chest.
Simply long jump to the chest.
Aim towards the ice wall and pull out a bomb. A few seconds before it explodes jump towards the ice wall. The bomb boost should cause you to land on top of the wall. Once you reach the upper ledge, aim the Gale Boomerang at the cannon and use a Long Jump to get to the opposite side of the courtyard.
Since the Snowpeak Ruins are accessed at a different point in the Wii any% route as compared to the GameCube any% route, you can still get to the opposite side of the courtyard. Place a bomb a foot or two behind the wall with the cannon behind it. Get out the spinner, and bounce off the wall into the bomb. If done correctly, you should boost onto the wall.
As Wolf Link, get into the corner to the right of the freezard and line up with the wall in front of you. Go into C-up and turn to the left until you get frozen. Break out of the ice, hold forward and press B to attack. If done correctly, you should clip through the door. Once you clip, transform back into Human Link and open the door.
After the Dark Hammer throws his Ball & Chain at you, use quickspins on his tail to quickly defeat him.