The check in process and boarding was seamless. Arriving at the island, there's a brief orientation, then you're off to explore on your own. I don't know if it was just the day that I went (a Sunday), but doing the morning tour gave me more chances to explore without encountering too many crowds.
Set out for Alcatraz Island in the morning, before the crowds arrive, on this early-access tour. Ride the ferry from Pier 33 and then embark on the award-winning audio tour that tells the tales from inside the prison. After returning to the wharf, use your included credit to purchase lunch at select food vendors.