A major disappointment

Unfortunately, our Captain made an announcement that due to particularly nasty weather and sea conditions, we will be unable to dock in St Petersburg Monday, instead we will delay it until Wednesday.  This means we stay in Tallinn an extra day, and our visit to Helsinki is moved up a day, but the bad news is..... the 3-day comprehensive stay in St. Petersburg is now reduced to one day.  This extended St. Petersburg visit was one of the major reasons we chose this trip, so it's a huge disappointment.  We were to take a high speed train to Moscow on the middle day, so that's out, too.  Now we're scrambling to figure out how to see the maximum with the minimum time.  Rats.