You can get your Mayan day sign and a full reading from several daykeepers at the lake. Kaqchikel and Tzu’tujil Maya can do so in Spanish or English, and several non-Maya also do authentic Mayan astrology readings. In San Pedro, check it out at Sina’s Books. In San Marcos, ask at Tienda 2012.
Mayan Astrology at Lake Atitlan
It is even possible to study the Sacred Calendar and Mayan spirituality in San Marcos and San Pedro. For more about Mayan astrology, see Mayan Astrology