Many Zelda games nowdays feature an 'item trading quest' of sorts. Someone in the game will give you a seemingly useless item, which annother NPC wants, and will give you annother item for. This cycle goes on, usually concluding with a more powerful sword or annother worthwhile reward.
The item trading quest in Seasons (which contains a lot of Ocarina of Time cameos) can be completed just before the 6th dungeon.
Step 1: Get the Cuccodex from the Biologist's House in Horon Village. You'll need Ember Seeds.
Step 2: Give the Cuccodex to Malon, north of Horon Village
Step 3: Find Maple (randomly in the overworld) for the next item.
Step 4: The doll goes to the woman in the house on the way to the 3rd dungeon. Don't mind Queen Ambi, she's just a password game cameo.
Step 5: The next one's in Subrosia. Find the Chef's Kitchen
Step 6: Give the soup to Biggoron, on top of Goron Mountain. You can't miss him, he takes up most of the screen.
Step 7: Trade the Vase to Ingo (annother OoT cameo) His lives in the top left corner of Sunken City.
Step 8: Give the fish to the elderly man with the cat, immediatly north of Horon Village.
Step 9: Use the megaphone to wake up Talon. He's in a cave on Goron Mountain, I can't remember which.
Step 10: Give the mushroom to Syrup the witch in Sunken City. (you can only reach her in winter) There's actually a second reward to this quest, as Syrup won't sell you potions until you complete this step.
Step 11: It's obvious who the Wooden Bird goes to, the Clock Shop in Horon Village would have served no purpose otherwise.
Step 12: Give the grease to the windmill guy, just east of the village, in exchange for his phonograph (it actually looks more like a gramaphone) Strangely, he pulls annother one out of nowhere.
Step 13: Play the phonograph to the Deku Scrub in the Lost Woods (inside Tarm Ruins)
Step 14: Enter the Lost Woods. Here you must exit the screen to the west 4 times in different seasons. The order is Winter, Autumn, Spring, Summer. (that's the reference to 'temperatures rising') Watch out for the infinatly respawining Like-Likes!