Birthday Dinner in Lisbon
Outside Lisbon but worth the trip to Cascais, Forteleza do Guincho. may be spend the night there too.
In Lisbon itself, Belcanto or Eleven.
I personnally would go to Gambrinus, but it's probably too "Old Lisbon"...
Look at http://www.lisbonlux.com/lisbon-resta... the site is pretty accurate.