Tikal National Park finds itself on most itineraries to Guatemala. It stands as the biggest and best preserved Mayan site in the country. The structures may look familiar - this is because George Lucas filmed one of his Star Wars epics on its location. The site is expansive and overly impressive however I only recommend one day there. Arriving very early or staying until sunset (working around the crowds) makes the experience even more rewarding.
IF YOU FLY THERE USING STATE RUN TAG AIRLINES. MAKE SURE YOU ARRIVE AT THE AIRPORT AT LEAST TWO HOURS BEFORE THE FLIGHT. DON'T LET THE "DOMESTIC" STATUS FOOL YOU. THEY WONT LET YOU ON THE PLANE PAST CHECK IN TIME.