Spring Break is spread throughout the country from early to mid-March, particularly Texas schools, and mid to late April, schools up north/back east. So, there's a good month and half a stretch. I would assume that the week with Good Friday, 4th week of March, will be the busiest. It will probably be busier after that through the first or second week of April. Earlier in March and late April will be the least busy, but not probably slow.