It’s a fifteen minute walk to the meeting point for the first tour and I have seventy minutes to get there so time for a follow your nose wander. I loved this part of the meeting instructions:

Meet by the center statue. It's a big square with 2 fountains on each side and in the center a high column with a man on the top. If you are in a square with a statue of a man on a horse, you are in the wrong square.

Lets see what Lisbon has to offer, I suspect the first answer will be Coffee!