If you enjoy crowds and like excitement, then plan to visit during national or religious holidays.  Always pre-book accommodations for holiday times, as hotels book up very early.  This will not be a budget holiday as hotel prices rise dramatically during these busy times.  The busiest times are the two weeks before Christmas to a week after new years, the week of Semanta Santa (Easter spring break), and Carnival week (early February).  St. Patrick's day (March 17th) is also a very busy Mexican holiday.  The prime high season (high cost) is from December 15th till after Easter.  The annual Mexican school vacation period of July and August is also considered high season, although not too many Canadians travel to Costa Alegre in summer.

Most people who come to Costa Alegre are looking for a quiet, laid back holiday, so usually arrive after the crowds leave or before they arrive.  All of November and the first two weeks of December are quieter, as well as the last three weeks in January till the end of March (before Carnival).  After Carnival it is quiet again until Semanta Santa (holy week, Easter) at the end of March.  It is very quiet after Easter.  Hotels seldom close for the low season, but restaurants do. If you go in October or November or after Easter you will have fewer choices of where to eat.