Jean Lafitte National Historical Park and Preserve has six sites scattered throughout south Louisiana. The Directions & Transportation page has links to maps of all six sites and links to information about what each site offers.
All sites are accessible by car. Airports serve New Orleans and Lafayette.
Public transportation is available only in New Orleans. Note that although the Barataria Preserve and Chalmette Battlefield/Chalmette National Cemetery are in the greater New Orleans area, they are in different parishes (counties) and so no public transportation is available from New Orleans. One-way taxi fares to either the Barataria Preserve or to Chalmette Battlefield/Chalmette National Cemetery are about the equivalent of a one-day car rental.
The paddlewheeler Creole Queen offers cruises to Chalmette Battlefield from New Orleans' French Quarter.