14th Bday Party!!

Okay so me and my friend want to have a really awesome bday party with so0o0o0o0o many people.. Probably around 100 or 200 and usually parties like this you would have in sumbodys backyard and swim and eat and dance and stuff... The problem is neither me or my friend has a pool although i have a huge backyard and our bday is in october but it will still b hott enough to swim... Anybody with any ideas tell me!!