Throughout his life, Hamilton recorded his walking and cycling trips, a total of 900 nights spent away from home. His earliest memories were committed to paper as a boy scout and the final entry in his diaries, when he was 69, records a cycle/camping trip from his retirement home in Bury St Edmunds, Suffolk, to West Runton, Norfolk - a distance of 48 miles each way.
The diaries comprise five large volumes (MSS.328/N93/1-5), each full of handwritten entries, sketches and photographs. They cover a number of trips throughout Great Britain, as well as trips to the Netherlands, Germany (in 1933) and France (in 1934). The last detailed descriptions and photographs date from 1936, after which most entries record only date and distance covered.