My husband and I booked a small walking tour of Lisbon with Your Friends in Lisbon and we really enjoyed it. They keep the groups small, this time it was just us an our guide Margarita. The tour was 3 hours covering central Lisbon area. Our guide was very knowledgeable and answered all our questions about the history of Lisbon and Portugal. The walk was not strenuous as she used the lifts to get to the Alfama district. Good recommendations on places to see based on our interests and also restaurant recommendations. We would definitely recommend if you are interested in history.