In reply to Murcantile:
To be honest, if you pick a route with stars next to it from any of the popular areas (Wen Zawn, Main Cliff, Castell Helen) you're unlikely to walk away disappointed. For starters though...
Wen Zawn - Dream (HVS), Concrete Chimney (HVS), Quartz Icicle (E2), Britomartis (HVS), Spider Wall (HVS).
Main Cliff - Scavenger Direct (HVS and better than the original), Gogarth (E1), Rat Race (E3). Maybe some of those routes like Emulator and Aardvark.
Yellow Wall - The Moon (E3).
Castell Helen - Blanco (HVS), NW Passage (E1), Atlantis/True Moments/Freebird (E1), Kalahari (E3).
Should be enough to get you started.