We are driving from LA to SF early March for our 40th Wedding Anniversary. Will be in SF one evening and our flight leaves from Oakland Airport at 4:45P.M. the next day. We have a reservation for Alcatraz Island for 8:45A.M. It says to allow 2 1/2 hours for Alcatraz. Do we have time to ride the Powell Hyde Line after Alcatraz? I'm not reading anything on how long it takes to ride the cable cars. Thanks.