It is easy to understand why this woman is happy: she is vacationing in Cancun. During the winter, the average daytime highs for sea and sunshine are 80 °F, the Caribbean Sea glistens as it laps along pristine beaches, plus air and hotel packages are abundant and reasonable. In addition, the nightlife is legendary yet the resorts cater to whatever style of R&R you seek. No wonder about five million tourists annually visit the northern part of the Yucatán Peninsula.