your passport isn't stamp regardless if one has a license or not I don't know why, as it didn't matter to me and in fact I would have thought it great fun to have a cuba stamp.
I can't image Starbucks and McDonalds on every corner as the people can't afford these types of luxuries, they are barely getting by as it is.
Every one has a job, yes, but the salaries are $15-$25 a month and the only people eating and drinking a various restaurants in old Havana are tourist.
And as someone else mentioned the inter structure is falling apart, beautiful old architectural just decaying.
The people are very friendly, the weather wonderful. Lots of cigars and rum but don't try to bring those items back into the US. Now you have issues.