I'm a huge fan of all kinds of myths--I've read everything from Celtic and Scandinavian myths to South American and African myths. And if you like the tale of Hunahpú and Xbalanqué you might enjoy a book called Barbecued Husbands, a collection of folk tales from Amazonian tribes. I remember a particularly lovely story about a brother and sister who are captured by the Jaguar people.
But my favorite, easily is, the epic of Gilgamesh. I first read it shortly after losing a very close, very old friend--someone who joked that she and I knew each other from birth. After the loss of Enkidu Gilgamesh goes through the five stages of grief. First there's anger, then denial, then depression, as expressed here:
When he had gone one double-hour,
thick is the darkness, there is no light;
he can see neither behind him nor ahead of him.
This is repeated three times until:
At the nearing of eleven double-hours, light breaks out.
At the nearing of twelve double-hours, the light is steady.
(quoted from Gilgamesh, translated by John Gardner and John Maier, with the assistance of Richard A. Henshaw.)
Finally he goes through bargaining as he tries and fails to achieve immortality and, returning to Uruk, there is acceptance.