Ideas on where to do a cool prom?

So I am in the prom committee and we are having trouble finding a good location to do it
We have considered a yacht and that did not work out and a hotel is getting annoying...

So any realistic and wonderful ideas would be appreciated.

Update: Okay
I live in California
Our budget is I guess 5,000
because we are a small school
our prom is going to have about 70 people
Update 2: I forgot to mention we live in LA, so something near that area if you have specific locations, thanks so much! :D
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