Bay seniors who’d like to experience WWII without the bombs and torpedos are invited aboard the SS Jeremiah O’Brien for a four-hour cruise this Saturday. It is one of the last two of the 2,710 Liberty ships and most days can be found docked at Fisherman’s Wharf. Her history is glorious including 11 crossings of the English Channel during the D-Day invasion. Sunday’s sail includes live entertainment, complimentary drinks and lunches for purchase. Tickets $88.