There are a series of circular walks available from the National Trails website:

In the Plan Your Visit section, check the box next to “Additional Walks” and the walks available will be highlighted on the map above.  Click on the walking symbols then click on the link from the text bubble to find further details. A small selection of the circular walks included are shown below (links open up PDF files on the National Trails website)

Avebury Heritage Site Circular Walk
Devil’s Punchbowl and Segsbury Camp Circular Walk
White Horse Hill Circular Walk
Ewelme Park Circular Walk
Compton Circular Walk
Ivinghoe Beacon