Freshly-Picked Tingle's Rosy Rupeeland/Lon Lon Meadow
Pinkle will once more contact you. When she's finished, head all the way east and a little north to find Duke. Talk to him to buy the Shovel for 750 rupees. Talk to him again to get the bridge repaired for 299 rupees. Now stand just a little north of him and head west until you see a big rock with purple flowers on top. The Look-What-I-Found Kid is hiding behind it. Talk to him to buy the Lon Lon Meadow map for 200 rupees.
Go a little more north to see a bipedal pig-like creature. This is an Oinker (the warrior kind to be exact). Watch him leave and return to the landing spot. The man standing just north-east of it will draw an X on your map when you talk to him. This X is where he has seen a girl not from Lon Lon Meadow. This girl is Missy. She has disappeared and her parents back in Port Town are incredibly worried. Go to the X-indicated spot. A little south of it you can find a pair of glasses behind an orange flower. Pick it up and follow the path west. When you see Aba, talk with her. Open your map. You'll see a pignose symbol on the map surrounded by a wall. This is the symbol used to indicate the location of an Oinker camp. Head to the southern part of it to see an Oinker entering the camp.
Dig around the soft patches of Lon Lon Meadow to find a Sweet Potato and go back to Port Town. Talk to Dave, the child sitting on the fountain, and give him the Sweet Potato in return for the Oinker Snout. With the Oinker Snout in hand its time to head back to Lon Lon Meadow, specifically the Oinker Camp. Before you head there, you may want to hire a Bodyguard from the Salon just east of the landing spot.
After arriving at the camp and using the Oinker snout your goal is too get rid of the two Oinkers here. Oinkers will throughout the game be among your toughest opponents, because you can't attack them unless they hit a wall or similar hard structure in an attempt to hit you. If you can manage to make one Oinker charge into another Oinker, both will be stunned. So when an Oinker charges at you, make sure you stand near a wall or get another Oinker between you and the charging one. Also be careful about your bodyguard's positioning, as they are not considered hard enough to stun an Oinker. Once they are stunned, indicated by a halo of yellow stars, this is your chance to rough'em up!
When you get rid of both Oinker warriors, the Oinker totem in the northern part of the camp will break open and reveal a bag. Pick it up to receive the Golden Button. Watch the cutscene of Missy trying to find her glasses. Follow her and give her glasses back.
After giving her glasses back, return to Port Town to see Missy reunite with her parents. Ask for 4000 rupees from her father, the Jeweller. Sell the Golden Button to the Guard if you want. Go to the Tower and donate 6000 rupees. You can now reach Deku Forest!