Rock Spire Isle is a small, narrow strip of land peeking out of the Great Sea. It features spires of solid rock and several boulders you can bomb. It has many goodies to collect.
Orange Rupee (via Sea Platforms)
Sail up to the trio of Sea Platforms in this sector and destroy the cannons on the farthest west and east Sea Platforms to reveal chests on each. Climb the middle platform’s ladder to discover a chest. Open it, then use the Deku Leaf to reach the other two Sea Platforms (the nearby updraft helps you reach the west platform). One chest has an Orange Rupee, and the others have small rewards.
Empty Bottle #3, Piece of Heart #22, and Treasure Chart #4 (via Beedle’s Shop Ship)
After receiving Beedle’s Chart in the mail, you can see that his Shop Ship appears here. It’s the only sector in which he wears a bronze helmet, meaning that he sells especially rare items here. These include an Empty Bottle for 500 Rupees, Piece of Heart #25 for 950 Rupees, and Treasure Chart #4 for 900 Rupees. After you buy these items, Beedle sells 30 bombs for 60 Rupees, 30 arrows for 60 Rupees, and a Red Potion for 30 Rupees.
Piece of Heart #26
Bomb two Warships to the southwest of Rock Spire Isle, then use the Grappling Hook to pull the treasure from the rings of light. The wreckage of one Warship yields an Orange Rupee; the other yields Piece of Heart #26.
Blue ChuChu
Climb the slope on one side of Rock Spire Isle and use bombs to clear boulders as you make your way across the spires. Defeat the Blue ChuChu on the last rock spire for a Blue Chu Jelly.
Treasure Chart #37 (via Secret Cave)
Bomb your way across the tops of the rock spires to a hole that leads to a Secret Cave. Drop into the Secret Cave below and pick up a Deku Stick. Light the Deku Stick on one of the nearby torches, then use it to light the other two torches. A horde of Keese attacks you. Wipe them out to reveal a chest containing Treasure Chart #37.
Piece of Heart #32 (via Treasure Chart #2)
Find and open Treasure Chart #2 (at Windfall Island [D2]) to pull a chest from the Great Sea near Rock Spire Isle. The chest contains Piece of Heart #32.