Fishing dock
Bottom hook: If you go behind the house, you’ll see there’s a small bridge, South-east of the map. Head towards it, take out your fishing rod and throw it there. You’ll fish a special bottom hook. With it, you’ll fish quicker. But be careful: if you try using it when renting the boat with company, the special hook will be taken away from you.
Extra bottle: There is a small lagoon heading north. If you fish there with your fishing rod you’ll get one extra bottle.
Gerudo Desert
Test room: There’s a hidden room in the desert where you’ll be able to find the famous “Great Fairies” belonging to every Zelda. On the desert zone where you open the portal, you’ll see there’s an enormous stone column very well dunk. Well, this stone piece is the Endil’s bridge piece which starts at the beginning of the game. Teleport the column to the Endil bridge and you’ll be able to access this dungeon were you’ll have to get room by room until you get to the end. Each 10 rooms you’ll find a Great Fairy which will fill one of the Hyrule fountains with fairies that can be collected in bottles. You’ll need almost all of the game items to get to the end, apart from good heart refills and potions so as not to die in the middle of the process. Take into account that the last rooms are really hard, specially the last one.
Death Mountain:
When you go to death mountain, and you arrive to the esplanade where there’s a stone with a hole and the vapor streams, there’s a creeper at the left of the stone where you can grab to with the claw. Inside this cavern there’s a golden Chuchu. If you kill him and refill a bottle with his dead jelly, it will refill all of your hearts and obtain extra strength when drinking it.