Strömma Kanalbolaget runs sightseeing tours of Stockholm. Boats leave from the quays outside the Royal Dramatic Theater, Grand Hotel, and City Hall. Stockholm Sightseeing, which leaves from Skeppsbron in front of the Grand, has four tours, including the "Under the Bridges" and "Historical Canal" tours.
Strömma Kanalbolaget (Strandvägen 16, Stockholm, 114 56. 08/12004000. www.stromma.se. Weekdays 9–5.)
The Stockholm Information Service runs several tours, including the "Romantic Stockholm" tour of the cathedral and City Hall; the "Royal Stockholm" tour, which includes visits to the Royal Palace and the Treasury; and the "Old Town Walkabout," which strolls through Gamla Stan in just over one hour.