The Dagny Johnson Key Largo Hammock Botanical State Park is a Florida State Park, located in the center of Key Largo in the Florida Keys, on County Road 905, one-quarter mile north of its intersection with the Overseas Highway (US 1).The park's name honors Dagny Johnson, a local environmentalist activist, and is constructed on land bought up in 1982 after the financial demise of Port Bougainville, a project which would have included 15 hotels and over 2000 condos.