Cancún is a coastal city in the tourist destination called The Mexican Caribbean, i.e., the state of Quintana Roo, on Mexico's Yucatan Peninsula. It is a popular vacation spot on the Caribbean coast.

Peak season in Cancun tends to run from December to April. Prices in both airfare and hotel increase dramatically during these times, while dropping in the summer and early autumn months. Late June is especially hot, so come prepared or try the off season. Hurricanes can be a major threat in late summer and autumn.

Those mostly seeking beaches and scuba diving, or who are a bit adventurous, can easily find rooms on equally beautiful and less crowded beaches along the coast just an hour or two south of Cancun for much less than the cost of major Cancun hotels.

Source: Wikitravel