Unfortunately the rested exp bonus is going to evaporate just after a few levels. It scales horribly imho with the earlier levels. Also if your in a FC could ask them to put up the exp buff during combat, it will help. Also you could throw in some cheap food for another 3% bonus exp. The rest of what Sylve said is pretty spot on. FATEs, Dungeons, and possibly Leve's if you have no use for them besides this.