Okay, so I've noticed that a bunch of quests let you choose an ingredient reward (i.e. Gold, Coconuts, Bamboo, ect.), and of all current recipes in the game (excluding Papaya Island, as I have not been able to access that yet), there exist 0 that use these ingredients. So my suggestion is to use these ingredients for recipes for things like Dogi's, strong medicines for healing, even things like single point skill reset books.
Since these quests give very few ingredients per quest, and force you to choose 1 of 3 ingredients each time, setting the ingredient requirements high for certain things would help keep them balanced. Otherwise, these ingredients just collect dust in banks/inventories, or are just sold for a minimal amount of Zeni, if not just downright discarded. This would help give them a use for crafting, and incentivize the use of crafting and leveling crafting skills.