Our guide was entertaining and knowledgeable. He also has a very nice singing voice! We learned a lot about the history of architecture along the river, but also some stories of events that took place in the past. The weather was awful, freezing rain and 32 degrees, but we sat on top because the lower floor is basically a bar with a few tables, and you can see nothing from there. I highly recommend the tour, but on a warm sunny day!
We did the 4 p.m. tour. Next time, I'd choose an earlier one as it was nearly sundown when we left. Don't arrive until 15 minutes before the tour because you'll be waiting in line the whole time. There is a small coffee shop just northwest of the starting point. We waited there until the last minute.