Maka Rah Shrine
At the center of Lake Kilsie, to the east of the Shrine itself, there is an tall island that sticks out of the water. Use a bomb to break the boulders on the top of this island, creating a wind geyser. Then use the paraglider to fly up and glide directly south to the other side of the water, away from the raft. You will see another pile of rocks at the bottom, under the overhang, that you can blow up. Do so and ride the updraft, then look northeast. There is a small island-like thing with yet another set of rocks. Ride on over and blow 'em up! Now look northwest. You can see an entrance to a cave at the top of the cliff marked by torches. Follow the cave down below and swim across some shallow water through a small passage on the right-side to arrive at the Shrine.
To reach this shrine, look directly west where the cliff face overlooks Lake Kilsie. Some torches will show the entrance to the cave, near the top of the cliff face. Follow the cave to the end to reach the shrine.
Steady Thy Heart
Run ahead and light the torch on the left. This can be done without even wasting an Arrow. Pull out your bow and dip the arrow in the lit torch to light it on fire and use that to light the other torch.
In the next area, patiently wait for the path to present itself and then quickly run across the platform while avoiding the spikes.
Defeat the four Guardian Scout I that appear. Big tip, this is the perfect spot to practice your timing with the shield deflect. Run towards the chest on the right corner of the room and activate Cryonis right underneath you (down on left buttons). The treasure chest contains ten Bomb Arrows. And then do the same thing on the left of the room for the switch to open the large door.
Step on the switch ahead and a large spiked ball will come rolling down, crashing through the wooden boxes ahead.
Run up ahead up the ramp and when you are halfway up, turn around to find some more large blocks. Toss a bomb and explode it to get rid of the blocks and then use Magnesis to grab the treasure. Pull it over towards you and open it to get a Diamond.
Up ahead there is a second treasure chest across the lava. Pull it closer and open it to get an Ancient Core.
Step on the switch here and a metal spiked ball will begin to roll down the ramp. Link can get out of the way and allow the spike to fall down, but it will then reappear. Use Magnesis to grab it when it's close and hold it above your head. Run forward to get to the top of the ramp. Then run over to the altar and speak with Maka Rah to get a Spirit Orb.
Blowup the boulder at the center of Lake Kilsie. Ride the wind geyser up with the Paraglider. Defeat the four Guardian Scout I enemies. Use Cryonis to reach the treasure chest. Pull over the treasure chest to get a Diamond. Pull over another chest to get an Ancient Core.