Here's a great chance for you to visit St. Petersburg without having to worry about obtaining a visa. St. Peterline offers visa-exempt cruises to St. Petersburg with departures on every Thursday and Saturday.
No reservations for following departures of M/S Princess Maria on Helsinki -St.Petersburg or St.Petersburg -Helsinki routes because of the charters: 15.-19.08, 21.-22.10, 01.-07.11.