Metro

METRO DO PORTO: http://www.metrodoporto.pt/en/

- Using this link, you can get to know the metro system and even download an app, which is essentially a map that you can reference, but no real timetables are available. No worries, Campanha has access to all lines and there is a train that can take you in one direction or another every 4-6 minutes.
- Go to the metro station at Trindade and get a gold metro card for the month ASAP. The office is on the street level and is pretty busy, so when you walk in, grab a number and wait your turn. You will need cash to purchase the monthly card and it will cost you anywhere from 30-40 euros depending on how many zones you want access to, but either way, it's well worth it in the long run and saves you a lot of time.
 - Also, NEVER EVER FORGET to validate your ticket when getting on the metro and when switching lines. The metro security will come around and ask you for you card and if you haven't validated it, it can be up a fine of 100 euros. Don't be that guy (or gal)!