After climbing up to the second floor, hop over the gaps while heading east to find a chest under some vines.

North-east from the main lobby. Go through the well to reach it.

Floor 3F, south side of the east room. Avoid the boulders to reach it.

End of the northernmost room. Need Blue Fire to melt the ice.

Easternmost room, after meeting Ruto.

Floor B2, behind a destroyable wall towards the south east. ReDead nearby.