Key Biscayne is an island connected to the southern part of Miami, connected by the Rickenbacker Causeway. There are two especially nice runs in this area. The run over the Causeway over to Key Biscayne is exhilarating, with great water views in every direction. There is a pathway for running over the bridge. It’s 3.1 miles one-way from the foot of the bridge in Miami to the Aquarium.Then it’s another 2.7 miles to the end of Crandon Park. Access the causeway from Brickell Ave. to the north (downtown) or Bayshore Dr. to the south.
Crandon Park is a great area for running in the northern part of Biscayne Bay. Accessed just past the Causeway (or left off the Causeway if you are running/driving), the 808-acre park features as well as a marina, golf course, tennis center, family amusement center, picnic shelters and a nature center. The beach on the Atlantic side is 2 miles long, and there are also miles of trails suitable for running.
It is also possible to put together a long run from Miami to the end of Key Biscayne. View map below.