The Bristol and Bath Railway Path is a paved multi-use path that follows a former railway for 15 miles between Bath and Bristol. It’s a great option for a longer off-road run. At the Bath end, there’s a lovely 4-5 section along the River Avon, between Pulteney Bridge and Brassmill Lane. It’s a scenic way to run along the river and see several Bath Sites.
West of Brassmile Lane, the path continues as the Bristol and Bath Railway Path toward Bristol, passing through a series of suburban communities. There are several parks along the way, as well as numerous historic bridges and tunnels. This terrific trail map has detailed information on the path, with numerous smaller maps broken into segment distances.
One fun option: Run the path one-way. A train between Bristol and Bath runs very regularly and takes only 20 minutes. Catch it from Stalford or points east.
Add-Ons: Parks along the way, headed west: Kelston Park, Coombe Brook Nature Preserve, Newtown Park. There’s a running track at the Whitehall School near the Bristol end of the path.