The map'd be rather old, and therefor some of the letters has been exposed to sun for a longer period of time, and thus some of the ink is unreadable.
Two birds, blue and golden, their gaze eternal
A path full of cursed green men,
Past the big hall of origination,
Across where servery once led to water,
To the left of a guardian of old,
To a temple of old treasure.
Along the way you'll fight some of said green cursed leper gnomes, and in front of where the treasure is within, an insane one of the sorts sit upon a giant mechanical mecha.
On his corpse you'll find a golden key, inlaid with gems.
Within the building on the blue carpet in the middle of the two eagles, is a big treasure chest. The key'd fit with some wiggling, making you able to find a great treasure of gold, gems, and jewelry within.
((And in case you can't make out yourself where this leads, since me and riddles and so on suck, here is a map I've made. But no peeking unless you absolutely can't make it out!))
[spoiler]
(http://i.imgur.com/yxdvv3v.jpg)