21st Birthday Ideas

Hello everyone, I'm planning a 21st Birthday Party in September. Just wondering if you had any ideas and/or good experiences. Looking for something fancy, maybe rent out a nice place maybe get some cool transport to get there or something. About 50 people probably attending.
Any help would be much appreciated.
P.S I do have some money to spend, the venue does not have to be free necessarily. Although I don't want to go overboard. You're only 21 once so might as well spend a bit of money on it.
P.S.S Not everyone will be 21.
Thankyou

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