I need GREAT 40th birthday celebration ideas!?

I posted this on my Facebook page-people came up with the usual ideas-dinner, movies. I am looking for something different. Perhaps a bonfire or ski adventure but nothing too costly. I am looking for great/exceptional ideas! I live in the midwest so it will be cold outside and it needs to be cost effective for both... show more I posted this on my Facebook page-people came up with the usual ideas-dinner, movies. I am looking for something different. Perhaps a bonfire or ski adventure but nothing too costly. I am looking for great/exceptional ideas! I live in the midwest so it will be cold outside and it needs to be cost effective for both myself and my guests! Best idea that I might actually be able to put together wins-I have a lot of experience planning events so I am open to all ideas!
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