Disembark from your cruise ship to meet your waiting coach, then depart for a 3.5-hour sightseeing tour of the city center.
Settle in to your seat and listen to your guide's commentary as you pass city landmarks such as the Uspenski Cathedral, Senate Square (where you'll disembark for a photo op), and the Lutheran Church. Pass City Hall, Finlandia Hall, and the Parliament House on your journey down Mannerheim Street. Get views of the Opera House and the Olympic Stadium (used in 1952), and make stops at The Rock Church and Sibelius Park.
End up at the Central Railway Station, where you can spend about half an hour exploring and shopping on your own. Opt to stay downtown longer or take the bus back to the port for drop-off.