Top 10 by Eyewitness Travel and Pocket Rough Guides by Rough Guides and Day By Day by Frommer’s are my 3 favorite travel guides because they are manageable, packable, short, sweet, and to the point. Oh, and they fit in most purses or jacket/coat pockets and have beautiful pictures!!
For a big overview of the country your visiting, my favorite guide series is DK Eyewitness Travel .
While in the Algarve, the Southern most region of Portugal, I mentioned to some new friends one evening that I was next going up to Porto and they told me, in no uncertain terms that, “I must try the Port at the Caves do Vinho do Porto, brand Ramos Pinto in Gaia”… Huh?!?