Hi Jennifer,
It's very difficult to predict how crowded the parks will be at Walt Disney World! I have found early May to be ever-so-slightly quieter, then as the month goes on the crowds begin to pick up. However, next May could be completely different! Schools in some parts of the country even begin their summer breaks in mid-May!
Walt Disney World offers a base multi-day ticket that includes entrance to one of the four theme parks each day. If you would like to be able to park hop, you would need to add the park hopper option to the base ticket. For example, a three day base ticket for an adult would be $274.00 (before taxes.) If you wanted to add park hopping, you would add $49.00 for a total of $323.00 (before taxes.) You can visit the
Tickets web page and play with the different ticket options to see what will work best for you.
Please let me know if I can help you any further!
Wishing you and your family a magical vacation,
Amy H