I used the Adobe Illustrator files from the Mystara.Thorf site and just ran with it. There's got to be a simpler way of doing it because the symbols he has on the Map layer do not match up with the hex grid on the layer above. That menas you have to Alt drag things around which is very time consuming. Anyone with a quicker method, I'd surely like to hear it.
I usually do more hand drawn sorts of maps like this one:
But, since we're playing OD&D via LL, I thought having a hex map for exploration would be more appropriate. Of course, my current cast of characters lack a ranger so exploration would likely turn into wandering aimlessly in the wilderness for days, if not weeks.