Go to Paris for New Year on the 4pm Eurostar and book to come back at lunchtime the next day.
You don't need to book a hotel room so you don't mind paying £10 a pint, you can drink the very reasonably priced champagne on the train out to get you in the mood and you can sleep on the way home.
Just try not to get tear-gassed in the melee around the Arc de Triomphe after midnight. And don't forget fireworks which you can happily launch in the street from your empty champagne bottle.
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