Debbie and I tackled this coastal challenge along the north shore of Martha's Vineyard. It may not have been a "trail" but it sure felt like one (in terms of roughness). Full report in my blog post. We rode our bikes early in the morning from Vineyard Haven. We locked them near the marina on Menemsha Pond. We started running from the tip of the jetty at low tide around 7:00 A.M. before it got too hot. The rocks were tricky and slippery. After we finished at the tip of the jetty at Lake Tashmoo, we ran back to Vineyard Haven (painful). We washed up and took an Uber ride back to our bikes, which we rode back to Vineyard Haven after a tour of Aquinnah (even more painful).
This was challenging, unique, and fun adventure. It's highly recommended.