People who visit the Mayan ruins at Tulum are quickly surprised by the heat. The average, year-round temperature is 88° and the site offers no shade from the intense Mexican sun. So bring your bathing suit. When you get too hot, walk down the staircase, go for a refreshing dip in the Caribbean Sea and then spread your towel on the sandy beach. What a perfect combination: ancient ruins without ruining your sunbathing time.