At the tourist office, you can purchase tickets for guided tours of the city, lasting 2 hours and taking in the highlights. Departure is from Torvet or Market Square daily at 11am between May 26 and August 24. Adults pay NOK195 ($39/£20), while children under 16 enter free if they're accompanied by an adult.
The tourist office publicizes a 1 1/2-hour sea tour, going along the canal harbor and up the River Nidelven and out to the fjord. From June 18 to August 13, it leaves Tuesday to Sunday at noon and 2pm, costing NOK140 ($28/£14) for adults and NOK55 ($11/£5.50) for ages 3 to 14. From August 14 to September 17 tours are on Wednesday, Friday, and Sunday at 2:30pm.
The tourist office can also recommend an evening boat tour, lasting 1 1/2 hours, departing every night between July 2 and August 13 at 6pm from the Ravnkloa market. The cost is NOK140 ($28/£14) for adults and NOK55 ($11/£5.50) for children ages 3 to 14. For this and the sea tour above, buy your tickets directly on the boat.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.