The Cam runs past the end of Shelford recreation ground, where the bylaws require 'proper swimming dress' to be worn and give away its heritage as the training pool of the village children in decades past.
There is a wooden piled bank, with easy entry to the river which has a gravel bed and is plenty deep enough to swim, but is prone to lillies and weed in the summer. The publicly accessible riverbank is about 200m long.
Tea and cakes are available at the bakers over the road, although don't expect much in to Saturday afternoon or on a Sunday. Park at the village hall car park.
This is a crowd-sourced map. Abilities vary, and conditions change. Always assess risks for yourself before getting in.