My DD's Spring Break is from March 31-April 6, but she goes to Cal State Long Beach. I think it will be crowded, but not as bad as the two weeks prior. Have a wonderful trip!
I think there's still a lot of schools with spring break this month, at least in Washington and Utah. My kids spring break is the 7-11, and my friends kids have it the week before. Also, my SIL's kids are out the first week in April (they are in Utah). I'd still go expecting crowds...better to be prepared.