When Lunia opens again i plan on doing every quest possible and doing them over and over as much as i can so that i can lvl fast.

not sure which one is the best, but i have always found that i lvl fast when i do the whirlwind king quest and yeti cave, but it will take awhile to get there once we restart.

ok - i have found that farming a few stages for exp gets you lvling fast, as well as getting the bonus exp from secrets.
i didnt think to make a list of the stages so if anyone can post a list that would be great!

as well you can do the Windhill and Yeti Quests....although i am finding the Yeti Quest to be considerably harder than before!