From Highland Street Foundation's website:
Free Fun Fridays invites Massachusetts residents and tourists to visit designated cultural attractions every Friday this summer with free admission. No registration or tickets required. Visit and Enjoy!
This is a free ferry ride to either (or both) of the two most popular Boston Harbor Islands – Georges Island (with historic Fort Warren and ranger-guided tours) and Spectacle Island (with a life-guard supervised beach and 5 miles of hiking trails).
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Free tickets for the Harbor Islands Express Ferry will be distributed first come, first served at Long Wharf-North in downtown Boston (near the Aquarium subway station), with lines forming at 6:30 am. The ferry leaves every 30 minutes starting at 8:30 am, with a 3 hour window to return. Each person in line may pick up a maximum of 4 tickets. (There will be no special arrangements for groups of more than 4 to be on the same ferry.) Tickets will be handed out for the earliest ferry, then the next, and so on, until all ferry seats for the day are distributed – last year, all tickets were distributed by 10:30 am.