Coast is clear
But in his mind, the dream that he had was something that no one could take away, and he needed to do this. So he walked about the pyramids and looked to see where all the police and security guards were. He was going to try and sneak past them and get onto the pyramid.
When he finally looked around and saw that the coast was clear, he knew that he was going to climb the great pyramid, the largest of the rest. If he was going to do this and risk going to jail, he might as well go for the grandest structure available.