Family of 4 will be in SPb for a week, Thursday to Thursday. I'm trying to map out a tentative day-by-day division of what to see when. (I know that life is what happens when you've made other plans, but I still like to plan.) I'll be careful about checking what's open on what days, but I'm asking a more subtle question: to avoid crowds and otherwise make the best use of our time, what's best done on weekdays, and what can safely be left for weekends? I'm GUESSING that if we plan on seeing Peterhof, the Peter & Paul Fortress, and the Aurora, then we should plan on seeing those sights on weekdays, because they're the kind of attraction for which locals add to weekend crowds. Same for a canal cruise. And I'm GUESSING that the Hermitage doesn't vary as much from working to weekend days, so we can plan on one of our two likely visits for the weekend. But are my guesses right, and does anyone have tips along those lines?