Quests worth doing ?

So yeah, Hi. I quit about a year ago and came back to try the new Dual Blade class. Anyways, I want to know what are the quests/new quests worth doing now .. The game has changed so much I don't even understand it anymore. I've done the Mushroom Kingdom (or something) quests and the one that gives the animal head hat. What else should I do ?

I would go to kerning city subway station and head to kerning sqaure around level 40 (50 is the max level to be in there). The quest lines give decent exp, good exp from mobs and a +1 all stat earring at the end.