There are now photographs on the Eynsham Photo Map of a lovely 4-mile circular walk leading south from the village and heading back up north via the River Thames. These pictures show all the gates, stiles and footbridges along the route so that anyone wanting to try it can see how accessible it is for them (there are photos of some of the views, too!).
This walk is Route 1 of the Eynsham Circular Walks on the Oxfordshire County Council website, from where a downloadable map is available