Reaching Great Bay Coast
Head to Termina Field and summon Epona , mount her, then ride west. Speed up with some carrots and leap the wall at the west end to reach the new area.
Take note of the large boulder you passed just before leaping over, you’ll come back to it shortly.
The Zora, Mikau
This is a large water area if you couldn’t tell upon entering. The two houses off to your left are of no use to you right now, so swim out into the water to spot Mikau floating face down.
Grab him and pull him to shore where he will tell you his plight. He is a member of the Zora band the Indigo-Gos and their lead singer Lulu laid Zora Eggs but the nearby Gerudo Pirates stole them and he was defeated trying to get them back.
Play the Song of Healing for Mikau to heal his soul, resulting in him fading away but leaving the Zora Mask for Link.
Map of Great Bay
Use the gravemarker of Mikau to learn how to use the Zora skills then swim to the Marine Research Lab in the distance. Break Tingle’s balloon and purchase the area map for 20 Rupees .
Be sure to use the Owl Statue here to create a save/warp point for now and the future.