To embark on the Far Harbor DLC adventure, you must first complete some initial progress in the main questline. Specifically, meet Nick Valentine through the early objective called “Getting a Clue.” Once you have crossed paths with Valentine, you’ll gain access to the DLC. Begin your Fallout 4 game and open the Pip-Boy to find a quest named “Far From Home.” This quest prompts you to tune in to the Valentine’s Detective Agency radio station. Follow the radio’s guidance to visit Nick Valentine’s assistant Ellie in Diamond City. Ellie will provide further details about the quest, directing you to the northern coast of the map and the Nakano Residence. Step inside the residence and engage in conversation with Mr. Nakano. Explore the house to collect his tapes, which will grant you permission to use his boat for transportation to Far Harbor, the new zone awaits your arrival.