Travel tips for Havana, Cuba?

I'll be traveling to Havana, Cuba for 4 or 5 days this Fall and I am asking for any recommended activities or destinations to put on an itinerary.

My main interests are (1) anything to do with the history of the Cuban Revolution and (2) social and technological measures taken to cope with constraints of the trade embargo (and yes, this even includes maintenance of old automobiles); and I'm not particularly interested in Ernest Hemingway, smoking cigars or getting drunk on rum. I will have a 12 and 14 year old kid with me, so I'm also looking for some interesting, age-appropriate activities for them. I will make an effort to take a day trip to the Che Guevara mausoleum in Santa Clara, but the rest of the time will be in or very near Havana. What do you recommend?