Portugal: second stop with a baby
 

For someone traveling to Portugal with a 6 month old (going to a family wedding near Lisbon) wanting a second stop (not the Algarve), what destinations might be worth consideration?
This will be in June and they would like luxury accommodations, but not where other guests will roll their eyes as infants don't fit the scene. I know that they are considering
Porto and Douro. Would appreciate any thoughts.

In general, Portuguese love kids, so they should expect lots of attention from locals.