You can organize your stay alone. Don't forget to make your visa on time. Low cost airlines offer direct flights to St. Petersburg. You can book your hotel from home, but on site the choice is wide. Going alone is the right option to enjoy the Nuits blanches at your own pace, depending on the encounters. You can also land in Moscow, visit the city for two days and take the high-speed train that links St. Petersburg in 5 hours.