While I was in St. Petersburg, I witnessed a lot of wedding parties walking around town. Apparently it is a tradition for newly married couples to visit various monuments around town after the wedding ceremony.
Exploring the Winter palace/Hermitage is a must when visiting St.Petersburg.
But take the trip to Pushkin (Tsarskoe Selo) as well to see the Catherine palace and the Alexander palace. Wonderful surroundings including the most beautiful English-style park with a lake. Idyllic!
Another two and a half miles from Pushkin is Pavlovsk.
Here you'll find an immense park, which is a masterpiece of sculpture and scenery.
St. Petersburg is currently (Aug 2001) undergoing a major restoration program leading up to its 300th birthday in 2003 so many of its famous attractions are obscured by scaffolding etc.
If you want an unobscured view of these sites than maybe you should delay your trip until 2003
This is the tomb of the famouse Russian Rock singer Victor Tsoi ('Kino'). He died in automobile accident in 1990. Now many of Russian singers (Zemfira, Mumii Troll, Checherina...) sing his songs.
It was his birthday at the end of June. There are always plenty of flowers and people on the Bogoslovskoje graveyard.
I have been in St Petersburg many times but I did not know about this mosque (not far from Peter & Paul fortress) until the last visit.