One of the highlights was a sightseeing event called "free tour". These guys are locals and meet with you and a couple of other tourists at a location to start showing you the city "their way". Means, there's no fix tour program - every local shows what she/he likes most at their city.
The funny point is: At the end you pay what you want to - even nothing to pay is okay. Of course we paid because we liked the tour very much.
There was a "drink stop" at this nice lady's house in Alfama and she served self made cherry liquor. It was mega tasty.