This is the preliminary crowd calendar for April 2014. Click to enlarge:
If you have no idea what the numbers and letters mean, the top of this post explains it.
Spring break season extends into April, culminating in some of the heaviest crowds of the year over Easter week. The week before is considerably less crowded. The week after is also less crowded. If you can hold off on your vacation until the last week of April moving into May, you’ll be in much better shape. The first week in March is also considerably less crowded. On the plus side, temperatures and weather are considerably nicer than the summer with similar operating hours and plentiful evening entertainment.