On a personal note, I've combined Lisbon and a conference before,
neuroscience conference as it happened, and it was fantastic. There was
more than enough to keep my wife happy while I was at the conference
(she's definitely the more cultured of the two of us), and the city
itself is amazing!
The
I'll second Gregor's recommendation of Lisbon. Fantastic city to visit. We
love it, and usually think we're going to visit the many museums and other
cultural sites but end up buying an all-day tram pass and riding around on
the wonderful variety of trams, funiculars and (our favourite) the ornate