The Twin Sisters Traverse is a classic scrambling route in NW Washington. It includes great running and scrambling, and travels across to the more remote east side of the range to cross the Sisters glacier. The scenery and terrain is beautiful. The rock is mostly olivine, one of the few places where significant amounts of it are above the Earth's crust, and it's very sticky and easy to climb on. 

The Shale Trail is a 16 mile walking, running and cycling route between West Calder and Winchburgh, via the Almond Valley Heritage Centre in Livingston and the Broxburn using the Union Canal.  The trail passes through several historical shale mining towns.

The surface of the path route is also variable ranging from small sections of woodland track which will become muddy to sections of tarmacked path. 

https://shaletrail.co.uk/