Malmesbury is a small town in southern Cotswolds that is part of the Wiltshire county. You could do some sightseeing like visiting the Athelstan Museum to learn about the history of Malmesbury. Once you are done there you could go for a nice relaxing stroll through Abbey House Gardens. A 5 acres property. The property is privately owned but it’s open 7 days a week from March till October.
Once you are done with that why not pick up some lunch at a local bakery and eat with a nice view next to the River Avon.