When we went to Tulum we arrived just as the site opened. Fortunately my travel companions share my aversion to crowds so as we walked through the ruins the iguanas were largely undisturbed. They watched us carefully and I suspect that some people must be throwing stones because they're quite shy. As more people arrived most retreated to more secluded areas but I caught this guy before he beat his retreat.
Canon 1D X, Canon 70-200/f2.8L IS Mark II
200mm, f4, 1/250 sec @ 100 ISO