Looks like you had fun! I'm glad you made it to Union Square AND Pier 39. Next time .... we'll have to meet! You got a deal on the parking - $18 to park all day in S.F. is almost unheard of. The F-line isn't a bus - it's a trolley. Trolleys are the ones with the wires overhead. Cable cars are pulled by a cable that runs underground. Looks like you got a ride on one of the historical trolleys. What fun!