The UK’s fifth-longest river, the River Great Ouse, flows right by Ely and is the city’s go-to outdoor playground. For boaters, the draw is the Ely marina and a waterway navigable from Bedford all the way to the coast at King’s Lynn in Norfolk. Walkers can relish long-distance paths like the Ouse Valley Way, where you can walk or cycle off-road to Cambridge. Look out for riverside camping in wildflower meadows a few miles northeast of Ely.