A quest menu with a list of all available quests, which you can click on, that will show you the reward / location to start it.
My issue with most MMO's questing is that there is an obfuscation of the quests benefits, and where to even start one. For example, if you are playing FF14 and want to unlock a specific weapon mog, you need to google in order to find it.
I think a system similar to what Runescape has is a great solution, seeing all of the quests, and being able to click on them, seeing where to start them, and the rewards for completing it will help a ton.

