The dungeon build should be alright for world quests. Especially when you get gear and can do large aoe pulls even as feral.
If that is not to your taste you can try the leveling builds even at level 70. They usually assume you're doing quests or running from one quest to another and they don't assume you have tons of great gear.
I don't have a guide, but I suggest starting with a default build and tweaking it slowly until you remove all the stuff you don't like. Change a talent, fight a few things, repeat.
Also, guardian is a tank spec. They're all slow but survivable. That's the tradeoff. Dps specs, feral, are faster but more fragile.
Is there a default build? I know guardian is tank, but so far (im already level 70) it is much faster and have better survivability than feral.
Everything has a default build. It's in the drop down menu in the bottom left. Blizzard provides it. If you don't like it, import one from WoWHead or Icy Veins. Then tweak it as you like.
I don't wanna sound elitist but, if guardian is faster than feral, you are playing feral wrong. It's worth checking out a guide to have a general ideal of the rotation