Directions to Coast Guard Beach, Eastham, Cape Cod. At the Cape Cod Canal take Rt6 over the Sagamore Bridge and continue on Rt 6 until you enter Eastham. You will see the Salt Pond Visitor Center on your right. Turn right at the stop light. That is Nauset Rd., go straight it will turn into Doane Rd. when you come to the beach turn right, the Coast Guard Building is on the left.