How do you get to the boss's liar on the part when your in the heavens..

Right this may not be accurate off the top of my head but...
In the main entrance room you have a choice of going north, east or west and it has four pillars, one of these pillars doesn't have a top so clawshot up to it then climb to the top, the clawshot a small patch of vines the ceiling.

Climb up, clawshot the north part roof of the new room, lower yourself down until you see a red sphere, pull out your other clawshot, hook it and put on your iron boots, exit through the northern door, use the fan blades combined with your clawshots to get across, in the next room clawshot up the fan blades to the boss door, enter.

Check a walkthrough on this site if you need more info.

I'll assume you've already got the double clawshots. Get to the area surrounding the top of the tower (get to it from the room with all the peahats). Climb up the vines at the side then change in to a wolf to get across the tightropes. Enter the room (may need a key, can't remember) and defeat the two large helmasaurs (the wind blasting up may make this harder). Clawshot across the room (or walk across with the iron boots) and open the chest here for the boss key.