The most prominent structure in the Grupo °ä´Ç²úá is La Iglesia (the Church). It's an enormous pyramid; if you were allowed to climb it, you could see the surrounding lakes (which look lovely on a clear day) and the Nohoch Mul pyramid. To reach it walk just under 100m along the main path from the entrance and turn right.
Take the time to explore Grupo °ä´Ç²úá; it has a couple of corbeled-vault passages you can walk through. Near its northern edge, on the way back to the main path and the bicycle concession, is a very well-restored juego de pelota (ball court).