There’s some lovely waterfront running in Seaford, a town in East Sussex just east of Newhaven and 12 miles east of Brighton. A waterfront path runs along the Channel Coast from the Bishopstone train station east to the Seaford Head Nature Reserve. The wide, paved path runs right along the water, starting out as Marine Parade, and then turns into Esplanade. It goes for 1.6 miles to Seaford Head West. Note: This beach is also good for running.

Marine Parade, Seaford. Google Street View

At that point, the path turns into more of a trail run (easy surface) and becomes hillier, rising above the water into the limestone cliffs for another 1.6 miles. We then do a ~ 1 mile  loop around the trails of the Seaford Head Nature Reserve (rolling hills), and then retrace steps to the start. The full route is 7 miles, but there are options to shorten by doing any sort of there and back, or add on with some additional trails in the preserve.

Add-Ons: Seaford Head Nature Reserve