Directions to Night Elf Ainethill in DarnassusFollow

Short version: Pay a mage to portal you there, or a warlock in Darnassus to summon you there.

Long version: Take the tram to Ironforge. Exit Ironforge and head to the horth east corner of the zone, going through tunnels until you reach Loch Modan. Get the flight path in Thelsamar while you are there. Run north and head through the tunnel there, following the road into the Wetlands. Once in the Wetlands, head west along the road following it the whole way until you reach Menethil Harbor. Get the flight path there. Then head to the dock, the one on your right if you are facing out over the water. (Ask the NPC there if you are not sure you are at the right dock) Wait for the boat to come, board and take it to Auberdine. Get off the boat, get the flight path there. Then board the boat that was directly across from the one you arrived on and take it to Rutheran Village. Walk through the pink glowy light and you're now in Darnassus!

Be happy you only have to make the run once :)