Called the Venice of the Cotswolds, which overstates it slightly but captures the appeal: the River Windrush runs through the centre flanked by low stone bridges, and in summer children paddle and dogs splash. It's as picturesque as a place is allowed to be.
Popular enough to get crowded on weekends; arrive early morning for the version that matches the postcards. Combine with a walk to Upper Slaughter and Lower Slaughter for quieter Cotswold villages.