What do I do now?

Well that depends on what you've just done before that. If you did that as soon as you ot the rod, you should go to the isle of Gust, in the middle of the NW quadrant. If you've already done that and beaten the boss and gotten it's fairy, it's time to go back to the Temple of the Ocean King! Update the question if you've done all that and are still confused

Ok. From the beginning of the island...
1. Go up and around to get to the little plateaus where you must jump across them w/o falling... Do that.
2. When you're all the way across, there should be a shallow area. In that area should be a crack in the wall. Blow it up with one of the Bomb flowers! This is the Wayfarer's Hideout! Open the chest and take note of the map.
3. Exit and use the wind to help you jump to the ledge to the right when exiting the hideout.
4. Go into the cave and wipe out the Miniblins (AKA little purple goblin things). Then open the two chests and exit out the other end of the cave.
5. Use the wind to get up to the ledge and to the opposite ledge above the cave opening.
6. Go on down to the temple opening and read and take note of the plaque and map.
7. Thall shalt use thy mighty shovel (and sword)to carve a path to the marked area. 8. Take note of the three marked windmills on your map and close the geysers up to proceed. 9. Whack the statue-thing and heed his warning!
10. Now make your way (silently) to the windmills and blow in your mic at each one to get it to spin
10.5. These Sandworms are annoying, aren't they? Maybe theres something around here you could use to.... I don't know... Blow them up?
11. Once all three mills are spinning, they way opens up! But the worms are still there so be cautious (or destructive ;)).

Hope I helped

Use another question if you get stuck again l8r