The window period can sort of be thought of as an STD test waiting period. After you are exposed to a disease and become infected, you won't test positive right away. Instead, there is generally a length of time before you will test positive for the disease. That period is known as the window period or the STD testing window. It's different from the incubation period, which is the time that passes between being exposed to a disease and starting to experience symptoms.
From mid-February to early April, thousands of college students descend on Cancun to celebrate spring break. Carnival, the pre-Lenten celebration, is a busy time in Cancun, as is Easter, when Mexicans head for the beach.
It is 1.5 hours flight time from Miami and four hours from Chicago. The best time to go to Cancun depends in part on whether you prefer to spend a lot of time on the beach and in the water, or if you like to spend most of your time shopping, dining and visiting the various attractions in the region.