If you plan to walk around the monuments, the most rewarding Stockholm Card (Stockholmskortet). It offers unrestricted movement of urban public transport, regional trains, trams, the ferry to Djurg?rden. It includes a free entrance to museums, sightseeing tours, parking also. The cards are valid 24, 48, or 72 hours (260 SEK, 390 SEK 540 SEK). Children under 7 are admitted free. Prior to use, you must select it. Keep in mind that a number of museums offer free entry, sometimes it pays to buy the card only for public transport links.