Yay. You actually cited where you got it from.
Don't really agree with it though...slimes at level 18-20? Orange Mushrooms definitely.
Meh, Over the Wall is okay...went there a bit at earlier levels...
PQ is definitely a 'No' if you're in Scania. Or if its a weekend. You can also PQ in the 21-25 too AS LONG AS YOU HAVE FRIENDS WHO WANT YOU. They should be fairly levels as well...doing PQ at 21 without friends is a horrible mistake most people make. It'll take more time finding a party to join than it will to level up most likely. Then there's the problem of missing. And once you get in, you wouldn't be able to hit ligators PROPERLY and Slime King and the Curse Eyes would be totally evil...plus you would be called a noob by your party members. ><
Ant Tunnel til 35 was great for me, I hardly got hit so it was potion conservative. Kitties from 30-35 was extremely hard, even with an above average weapon. Jr Sentinels BEFORE level 30 are hard, as although they deal only 20 damage or so, they have way too much hp.
The suggestion for the tower of Leattys/Dark Leattys is okay although its a bit less popular now that Blue Moons can be obtained easily from a quest.
And that's all I have to say until I get to level 40 ._.