Made a bit of mistake here! Intended doing an hour's canal cruise only - dad added a coach trip too - which we clearly had no time to do! Canal cruise was great - then spent of time in Amsterdam queuing to get money back!
Ship docked out in Altona - No 62 ferry calls right nextdoor!
Wait till 9 am (which it will be by the time your disembark!) and you can buy a 9-Uhr Gruppenkahrt (9am group ticket) for up to five adults for unlimited travel on Hamburg public transport for up to five adults!
Lovely city - airport is only 25 minutes ride on the S3 metro from the buzzing Landungsbrucken (main quay on the Elbe).