Abbazz
6x9 and be there!
pvdhaar said:You'll need a wide when it's crowded, and a fast lens for when the light gets low.. I'd say take an M6, a CV25/4 and a 35.
Raid, Peter's suggestion is 100% wise. Take any body you feel comfortable with and only two lenses: your fastest "normal" lens for all those dark places (many buildings in Portugal have small windows with shades in order to keep the sun out, so the inside of the house stays cool) and your widest lens for all those crowded places and narrow lanes.
Enjoy your holiday!
Abbazz