I first went to Dalaran at level 39, but it could be done at just about any level. Here's how:
First, I made sure all of my items were at 100% durability. I took the ship from Stormwind Harbor to Valiance Keep. I left the keep and found the first thing to attack. I was killed. I then ghost ran from the graveyard down the road towards Dragonblight. I ghost ran through Dragonblight to Crystalsong Forest.
Once you cross the border into Crystalsong forest, you get a spirit mount. You then fly as high as you can. When you get above Dalaran, you lose the spirit mount and drop in the city. I went as close as I could to the Violet Citadel because once you drop into the city, you need to go to the right of the stairs leading up to the Violet Citadel (as you're looking up the stairs). In the small graveyard there beside the Violet Citadel is a Spirit Healer.
Log out, log back in.
Get resurrected then go to the Silver Enclave and leave your hearthstone.
I just completed my Coin Master Achievement. Man, it takes forever to get all those coins and I must have fished up every other coin at least four times, and some five or six times, before I got Archimonde's Gold Coin.