Un-tick the sorting option at the top of the list.
Click on the related links, for a list of special quest rewards.
You find all the quests in the quest list, click on the quest tab.
See related links, for a list, at Runescape Wikia.
It's currently not possible to undo a quest in RuneScape.
During the quest: Creature of Frenkenstrain, you find an underground cavern that is full of them... I highly recommend the quest for anyone who wants to do experiments!
You get darklight during the quest "Shadow of the Storm". You can find the steps of this quest, and others, in great detail on sites such as runescape.wikia.com.
The legends quest on runescape is not gone, I suggest that you check again.
A quest on Runescape is an adventure that puts you in a conflict, you solve it and you get rewards like money, skill experience points, quest points, and items.
If you quit runescape...
There are many websites where one can get advice on completing a Runescape quest. The Runescape website itself offers advice as does the website Tip.It.
The quest Swept Away was released in RuneScape at the same time as the Halloween event in 2008.
There is no easy way to get Full Rune on Runescape, seeing as if you are new to Runescape, Full counts as Platebody not the chainbody, and to use the Platebody you will need to complete the "Dragon Slayer" Quest.---------------------However money wise, you can just mine Rune Essence until you gain the respected amount of money for it, or just kill hill giants for bones to sell.