Mini Golf
Go to a mini golf course and golf away.
Arcade/Video Games
Have a party at an arcade or stay in and have a video game party.
Bowling
Go to a bowling alley and bowl the night away.
Movies
Go out to the movie theatres or go and have a movie marathon in your house.
Hotel Party
Rent a hotel room, most hotels frown upon large parties so invite just a few close friends over.
Laser Tag
Get a group together and rent out a laser tag center for a couple of hours and compete against each other.
Sleepover
Invite friends over and tell them to bring their sleeping bags over and party the night away.