The second day was a tour of Catherine's summer palace in Pushkin. Hard to describe - total sensory overload. It made us understand why the Russian people felt it necessary to discard the Tsars. A bus tour of the city put everything in perspective, with lots of views of the shopping, palaces, canals, etc.
The last day was spent at Peterhof on the Baltic Sea, Peter the Great's summer palace. Also sumptuous with golden fountains and the reassembled Amber Room. Both of the summer palaces had been burned by the Nazis as they left defeated from the siege of Leningrad, so they have had meticulous reconstruction.
I definitely would like to go back. St. Petersburg is just stunning.