by He - Doug Wyckoff
Chichen Itza is one of the seven wonders of the world and after visiting I can see why. The design of the temple included architecture, mathematics, astrology, acoustics and a calendar that was accurate for over 5000yrs. They were pretty smart people, the ancient mayans.
Playa Del Carmen:
The beautiful white sand beaches are my favorite, with sugar fine sand that doesn't absorb the heat from the sun so you don't burn your feet when you walk across the beach to the water.