a white monkey with a golden mask
You finish off the forest temple mini boss
You have to find it in the temple of time, which is hidden in the sacred forest. if memory serves, you will find it after you defeat the mini boss.
The Gale Boomerang (who houses the Fairy of Winds) is found on the floor after you defeat the mini-boss, Ook.
Electrocute him.
the boss monkey has it and you need to defeat him to get it
Defeat the mini-boss in the Goron Mines (2nd temple)
It is somewhere in the where in the Wind Temple
It's on the map.
beat the boss
The room with the Deku Toad, the mini boss.
Yes. He is the mini boss in the water temple.