April is our favorite time of year to visit, as long as the week does NOT surround Easter. We would NEVER go, say Friday to Friday, when Easter is the Sunday in between the Fridays!
Otherwise, April weather is usually beautiful: blue skies, temps usually in the low 80's but can be warmer, no humidity, hardly any rain, good park hours, hardly any ride rehabs, and the crowds are very manageable.
Good luck!