Instead of driving around and having to deal with the burden and stress of focusing on the road, let your party bus driver worry about that. You should spend your big day having as much fun as you can, not focusing on the trivial things in life such as driving. Riding on a party bus for your birthday essentially means that instead of only having fun when you get to where you're going, you can have fun all day long.
When you arrive in New Castle, there are plenty of things for you and your friends to do after you step off of the party bus. You could visit some of New Castle's historic attractions such as the historic New Castle Court House, the Old Dutch House, the Read House and Gardens and the Amstel House. Or if you want to cut straight to some food and brews, you can just tell your party bus driver to take you to one of the area's many restaurants. New Castle is a great place for a Birthday party bus bash.