I did the Tour du Port last year and enjoyed it. I'll be doing the Buff Betty Adventure Race that day so I can't do it this year. I second the recommendation on their web site to use a bike with fairly wide tires, as there are lots of cobblestones and city streets in not-so-great shape. I rode my road bike and regretted it. There are a lot of people on the ride, including a lot of kids, who don't really know about riding etiquette, so you really need to be on your toes. My favorite part of the ride was Fort McHenry. Have a great time!