1. River Cam, Cambridge
Between Byron’s Pool and King’s Mill Weir, there’s a roughly two-mile-long, watery stretch where experienced wild swimmers can get in touch with the elements. Lower yourself into the Cam’s upper reaches and float through a dreamscape of vast meadows, low-hanging willow trees and smooth, arched bridges. If you’re more of the adventurous type, then join the traditional New Year’s Day swim in the Cam, where a bunch of intrepid aquanauts get splashy in frosty waters. Some say the experience is invigorating. Others say it’s just very, very cold.
Getting there: From 47 minutes by train from London King’s Cross to Cambridge; one hour 10 minutes by car from central London.