I, too, teach in NY so we are "stuck" with Pres. week. I agree with all the above posts. We, however, are unable to add days to a school vacation in my school, so I am stuck travelling at prime time.
Airfares: High. We just decided to fly down in the afternoon on Sat instead of the morning on Sun and saved $200 on Delta. We'll take Pop Century for one night. Even though it eats into our savings, we'll have a full day there on Sun instead of a half as originally planned.
Weather: Last year we were in shorts and tanks, but someone said that the week before you needed gloves! (maybe they weren't from NY) So it is unpredictable.
One water park is always under rehab.
Crowds: We usually go in the summer, too, and compared with that, the crowds are lighter than the summer, but still pretty heavy.
Feb. is one of our favorite times there. It is so refreshing to see colored flowers instead of white everywhere! It's a mental health trip!
Good Luck, you'll have a great time!