Tomorrow is Cinco de Mayo, which is observed to commemorate the Mexican's Army surprising victory over the French in the Battle of the Puebla (May 5th, 1862). Contrary to what many people believe, this is not to celebrate Mexico's Independence Day, which takes place in September. That being said, it is a day to celebrate Mexican pride.
If you're going to be in Orlando, and want to celebrate, head over to the Mexico Pavilion at Disney World's Epcot. To celebrate Cinco de Mayo, they'll be having fun kids and family activities, in addition to the wonderful food and events they're known for.