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I never heard of San Miguel de Allende so I looked it up. The architecture is stunning and the colors are nice. Not some place I would visit though.
http://www.travelandleisure.com/trip-ideas/city-vacations/san-miguel-de-allende-photos

Kayaking with whales would be so fun :)
https://www.visitmexico.com/en/main-activities/la-paz/discover-the-flora-and-fauna-of-magdalena-bay

What are you planning on doing in all these places?

If I go to Mexico in the distant future I would like to check out Aztec sites also. Great grandparents have some heritage in Mexico from what I understand.

Well, I never have plans, but I like visiting places for local people, the tourist places too =). I wanna try La Paz, I've never been there

I guess that's the real spirit of adventure to go with the opportunities of the day. You should! I think the experience would be really cool :D