College breaks and some northern schools have winter breaks starting in February. There are a lot of colleges off all through March. Most grade schools are off the week leading to or following Easter. Since Easter is toward the end of April next year, that will be the busiest time. Since that is when you are looking at going, make plans early, make ADR's for the restaurants you want to eat at, be flexible and plan to do parks early in the day and in the evenings to avoid crowds.