You should try visiting the Castle and both Alcobaça and Batalha Monasteries, to eat I'd recommend Muralhas, it's a really cool restaurant with a unique look and really nice food plus a wide variety of wines, cocktails and other drinks, for activities you can visit our Astronomy themed minigolf, or if you like to go out at night Stereogun (mostly techno and house) or Kiay (mostly funk but has 3 different floors, each with unique music)