Fire Mountain resembles a large, active volcano. You can’t traverse this island until you first cool the lava pouring from its top with an Ice Arrow. This requires the Fire/Ice Arrow upgrade for the Hero’s Bow.
Sea Platform
Sail to the single Sea Platform and destroy all its cannons to reveal a chest. Climb the ladder to reach the chest, and find a second chest. Both chests contain minor rewards.
Orange Rupee (via Big Octo #4)
An eight-eyed Big Octo is found in this sector. Sail toward the flock of circling seagulls to find it. Use the Boomerang to target up to five of its large, yellow eyes at once. When all eight eyes turn blue, the defeated Big Octo leaves behind a ring of light. Use the Grappling Hook to haul up a chest containing an Orange Rupee.
Silver Rupee (via Treasure Chart #37)
Find and open Treasure Chart #37 (inside the Secret Cave at Rock Spire Isle [B3]) to pull a chest from the Great Sea near Fire Mountain. The chest contains a Silver Rupee.
Power Bracelets (via Secret Cave)
To enter Fire Mountain’s Secret Cave and get the Power Bracelets, first shoot an Ice Arrow into the tall column of fire erupting from the top of the island. This deactivates the volcano for five minutes. Hurry and climb to the top of the island, then drop into the hole there to enter a Secret Cave where the Power Bracelets are kept. For more information, refer to the walkthrough.