Hit the beach at Barceloneta and take a quick dip in minus 8 degrees. Yes, IceBarcelona, an ice bar, will give you shelter from the heat of a summer day, with mittens and a winter coat exchanged for your sarong, while you sip cocktails and enjoy sculptures made of ice. The furry arctic-style jackets you get to wear are worth the €15 price of admission (not that you can take them home, but then you wouldn’t want to once you get outside again!), along with one drink.
Photo courtesy of IceBarcelona's Facebook page.