My city is famous - white nights, Hermitage and drawbridges. But i could offer you to show more special places no only in SPb but in suburb. For example - - abandoned Institute Pavlov (the place where he studied conditioned reflex from dogs) - manor princes Oleneva (where Pushkin met Decembrists) - "road of life" and a museums on it (the road running from St. Petersburg through Lake Ladoga, on which were transported the bread during the war with Hitler) - Shlisselburg, fortress Oreshek and ... a lot yet =))