The folks at Wendella have been in the sightseeing boat ride business longer than anyone in Chicago. They offer a variety of tours every day of the week. The one I went one was a combination tour of Lake Michigan and the Chicago River, which lasted 90 minutes and cost $19. Not bad! The whole thing was one big photo-op and you get to see the most famous, interesting landmarks in Chicago. Our guide, Tom, was exceptional; funny and informative, without sounding like he was making one big 90-minute speech (which, of course, he was). During weekends these tours tend to sell out, so reserve your space through your hotel concierge or go down to the pier to buy tickets early; even then, you should prepare to line up 30-45 minutes before departure time. It gets a little cool on the water in the evenings, especially on the lake, so bring a jacket.