Route submitted by Brett Tucker:

A 130 kilometer coastal walking trail located in south western Western Australia, which starts from Cape Naturaliste Lighthouse, Leeuwin-Naturaliste National Park, (13km from Dunsborough, which is 255km south of Perth).

The track finishes at Cape Leeuwin Lighthouse, Leeuwin Road, Augusta, which is 306km south of Perth.

http://www.capetocapetrack.com.au/

A long-distance walking route linking Loch Lomond, Gare Loch and Loch Long in four stages. Once of Scotland's Great Trails.

The Arran Coastal Way offers walkers a challenging and rewarding 65-mile / 105 kilometre circular route around the beautiful Isle of Arran.  One of Scotland's Great Trails.  

http://www.coastalway.co.uk

From Seattle (Golden Gardens Bathhouse) to Everett (Pigeon Creek TH). The 26 mile route stays to the west of the railroad tracks and only leaves the beach for short sections in Edmonds and Mukilteo, and then finishes on a short paved trail in Everett.

The challenge of this route is twofold: limited route existence due to tides and the ever-changing terrain of sand, sharp or slippery rocks, and some boulders.