My husband and I will be on the HAL cruise that will be in Warnemunde on Mon. July 26. I haven't visited Berlin since 1967 when the wall was still up and am lookig forward to seeing it again. How is the price difference between making train arrangements on your own vs the train excursions arranged by the ship? If you go with arrangments with the ship, will this avoid being stranded if you are late returning do to circumstances beyond your control?