Or, more appropriately, skip the Ice Cavern. While skipping the Serenade of Water only means a little extra walking, the biggest obsticle to overcome when skipping the Iron Boots is entering and beating the Water Temple.
Entering Water temple Edit
Discovered by Acryte
To the left of the entrance there is a small piece of land that is part of the large island you can stand on. Get on it and go as far submerged as possible without swimming. Now aim the hookshot and try to hit the crystal. Its difficult to hit because not much is in view but if you just try moving around a little bit you can get it. Then just dive into the temple if you have golden scale, and if you don't you can ocarina dive in.
There is also another way to enter Water Temple without iron Boots or hookshot. Go to the house near the lake. Go to one of the corners and try to get as luch of links face in the house as possible without being pushed out then turn around and backflip. If you were far enough in you will be inside the house. In front of the door there is ground missing so you can jumop OoB. From there swim to under the island where the water temple entrance is and navigate for the loading zone. The loading zone extends all the way up to the surface of the water so theres no need to dive.
In the Water temple Edit
While in the water temple there will obviously be many places you need to use Iron Boots, just use a Spell or Bottle Dive.