Following quiet road and staying close to the Atlantic Ocean, this seashore-hugging run is great for hot summer days and includes scenic views -- Dorchester's "Malibu" Beach, Fox Point, the UMass sailing dock, Dorchester Bay, the JFK Library, and several miles of Boston Harbor beachfront by the sea.

Here's a map of the 4.1-mile route:
See my winter jogging route here.