Ways for High school Senior class to raise money anyone?

[C-Wizzle]

Well my Senior class wants to go on a trip to Virginia beach and Bush Gardens and its pretty expensive. We need creatives ways to raise money, because the more money we raise, the less all the seniors have to pay for the trip. We want to do things in school that we know the underclassman will pay for, but us as a unit lack the creativity to think of any fun ideas. any suggestions besides bake sale? like special days or crazy events like "buy a senior" day or something? anything! lol