So much to choose from! On our 10-day cruise, we hit Stockholm, Sweden; Helsinki, Finland; St. Petersburg, Russia; Oslo, Norway; Talinn, Estonia; and Gdynia, Poland...from kayaking to walking tours to weirdly-shaped group bicycles, we're not even sure how to begin picking our activities! But our decision so far: we're going to experience the cities, not just watch them go by through the windows of a bus.