All times are approximate.
This is Guatemala. Nothing happens exactly on time. John and Alma Diehl can save you a lot of money on travel inside Guatemala and Central America, especially on package tours to Tikal, which will save you a lot of trouble. They're at 12 Avenida C-35 Zona 1 in Xela, right up from Parque Central. Email them before making final arrangements for travel, these people are the specialists.