No matter how much i try i just can not get to the windmill.....i know you have to glide but i never get anywhere near the windmill when i jump off the waterfall. Help please? >.>=\
You need to dash off of the edge so that Link ends up skydiving. Then you just guide him over to the nest. (And be sure to use the Wind Bellows to get the rupees in the nest.)
You can try getting it from Beedle's Airshop. My sister tried that and it worked for her. I wasn't there when it happened though, so I'm not entirely sure how she did it.
Tilt your wii remote forward and when you are over it, just use your sail cloth.