Shoreline launches 30-minute lake cruises every half-hour from its two dock locations at the Shedd Aquarium and Navy Pier. Shoreline has also gotten in on the popularity of architecture river tours. Narrated by architectural guides, they cost more than regular tours. A water taxi also runs every half-hour between Navy Pier and the Willis (Sears) Tower, Michigan Avenue, and Shedd Aquarium. Tickets for the water taxi cost $6 to $10, depending how far you travel.