Tikal was the last major prehispanic archeological site I visited on my Mexico-Guatemala-Belize trip last winter. And it was the best one!
The size of the site (gigantic), the number of pyramids and structure (numerous), the quality of the pyramids (amazing) and the wildlife (abundant) cannot be compared with other sites (even with Palenque). Me and my friend visited on a tour book at our hostel in Flores. We didn't took the sunrise tour, but rather the early bird one arriving in Tikal for opening. I think it's the best time to visit as it is not a ridiculously early wake-up, the crowds are still manageable and the wildlife is active. Our tour last half a day, and we head back to Flores at noon.
The most interesting complexes are la Gran Plaza, el Mundo Perdido, la Plaza de los Siete Templos and el Templo IV. It's a good idea to have a guide here to truly understand the site. Many pyramids and temples can be climbed on wooden structures. The view from la Gran Piramide de Mundo Perdido and from el Templo IV are nice. It's also nice to climb on Templo II and on both Acropolis Norte y Central to get the view over la Gran Plaza.
Wildlife we spotted include a lot of coatis, an agouti and howler and spider monkeys. Even without binoculars, we spotted 19 bird species, including cool ones such as great curassow, ocellated turkey, limpkin, slaty-tailed trogon, black-headed trogon, collared aracari, keel-billed toucan, orange-breasted falcon, red-lored amazon and montezuma oropendola.
In brief, Tikal deserves its world wonder status as one of the greatest prehispanic archeological site and a hotspot for North American tropical biodiversity. A must-see!