When you are an Adult, have the longshot and the hoverboots, go to Kakariko Village. Put on the hoverboots and longshot yourself on top of the building where the guy sits. Then Aim at the Windmill with the longshot and you will see a wooden thing. Aim at that with the longshot. Then walk up to the top of the windmill. There is a chicken. Grab it and float on to the roof of the shooting gallery. Then float on to the Impa's House (Chicken Barn). Go to the top and run left towards the mountain. Jump and you'll make it onto a mountain! I tried to jump to the other side. I had the distance, but it wouldn't let me get on.