There are several long distance paths that run through or close to Steyning. The best known are the South Downs Way, the Monarch’s Way and the Downs Link Path.
The South Downs Way is probably the most popular long distance path near Steyning. It passes several local landmarks: Chanctonbury Ring, 3 miles to the west and Devil’s Dyke, about 6 miles to the east, north of Brighton.
The final part of the South Downs Way to the east runs along the Seven Sisters (chalk cliffs) ending at Eastbourne. Read more at https://www.nationaltrail.co.uk/en_GB/trails/south-downs-way/
The Monarch’s Way in Sussex is part of the 615 mile footpath, followed by King Charles II, as he fled the country in 1651. His father Charles I had been executed 2 years earlier. It ends at the port in Shoreham by Sea (5 miles from Steyning) where Charles caught a boat to France.
Part of Charles route was from just south of Steyning up to Truleigh Hill. I recommend visiting the nearby Youth Hostel there and having tea and cake!
The Downs Link path runs between the North Downs Way and the South Downs Way. It is 37 miles long. You can join it in Steyning. There is also a coastal link path which goes to Shoreham by Sea.
Read more about the South Downs https://steyningcottages.co.uk/south-downs-national-park/