The quickest and most convenient way to see the highlights of Stockholm is to take one of the bus tours that leave from the Square of Gustaf Adolff, near the Kungsträdgården.
Stockholm Sightseeing (also known as City Sightseeing), Svenksundsragen 17 (tel. 08/12-00-4000; www.stockholmsightseeing.com), offers a variety of tours, mostly in summer. Tours depart from Gustaf Adolfs Torg in front of the Dansmuseet. "Panoramic Stockholm," a 1 1/2-hour tour for 210SEK ($42/£21), purports to show you Stockholm in record time. At least you'll see the landmarks and several waterscape views. This tour is conducted from March 24 to December 31. For "Stockholm in a Nutshell," you can take a 2 1/2-hour tour costing 330SEK ($66/£33), with departures from March 24 to December 17. This tour shows you the highlights of Stockholm, including a sail around the royal park at Djurgården. A more comprehensive tour, the "Grand Tour" lasts 3 1/2 hours and costs 395SEK ($79/£40). This tour is by both boat and bus. A tour known as "Old Town Combination" departs June 26 to August 27, lasts 2 1/2 hours, and costs 290SEK ($58/£29). The combined bus and walking tour includes a guided walking tour through Old Town with its narrow alleys and tiny courtyards. Finally, from June 26 to August 27, you can go on a 45-minute "Horse and Carriage Tour," costing 140SEK ($28/£14), which departs from Mynttorget by the Royal Palace.
Old Town Strolls -- Authorized guides lead 1-hour walking tours of the medieval lanes of Stockholm's Old Town. These walks are conducted daily from mid-June until late August, departing from the Royal Opera House at Gustav Adolfs Torg. The cost is 110SEK ($22/£11). Tickets and times of departure are available from Stockholm Sightseeing.
Stockholm Sightseeing offers the "Royal Canal Tour," March 24 to December 17 daily, at 30 minutes past the hour all day. Tours cost 140SEK ($28/£14) for adults, 70SEK ($14/£7) for children 6 to 11, and are free for children 5 and under. Visitors are ferried around the canals of Djurgården.