Disagree. It's the whole point of the page, so it isn't excessively redundant if you say it more than one way... I'd just put a single column that's a different color (ie, green) for the best day, maybe with an embedded checkmark or some other indicator for the color blind.
1. The URL - would be better if it's a dedicated domain name (e.g. whenshouldigo.com).
2. I agree with the parent about the color coding. It might be more clear if you use a red-green spectrum for each day (e.g. red for the evening, when things might be more busy, and green for the morning, when things might be less busy).
Google "comparison chart" and see how <a href="http://www.google.com/imgres?imgurl=http://printgreener.com/... facets</a> can inform a viewer in a simple way.