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).
