I forgot to ask Fromahead this week, so they sent it in kind of late. Here are SparkDungeon and OgreForest(3rdStar)
/ Exp Chart /
Spark Red - 100 exp crystals
Spark Blue - 100 exp crystals
Red Warrior - 80 exp crystals
Evil Eye - 70 exp crystals
A good alternative, Spark Dungeon gives as much exp crystals per second as Shallow Waters.
Nothing much to say here, except that the 6th star is located here. Most people have already found it. If not, then just try roaming around. What bugs me the most is that the monsters here give little exp crystals but do good damage on you. Running away is a good tactic too.