If I take the 8:45 am Early Bird boat to Alcatraz on a Tuesday (in late October) and want to do a full, unrushed tour before catching a flight out of SFO to the East Coast later that day (with no checked bags), what's the earliest flight I should try to book? Would 6:00 pm be doable, or is that too early? I'd have to pick up my carry-on at the Hyatt Centric after Alcatraz and then take BART over to SFO. Thanks.