Plan Lisbon by elevation. Start high in the morning, then let the day fall slowly through tiled streets, small squares, and stairways that turn a short distance into a real walk.
Save the most structured part of the day for lunch. A reservation gives the middle of the day a clear anchor, while the hours before and after can stay loose enough for viewpoints and unexpected side streets.
For the final evening, choose one miradouro and stay longer than planned. Lisbon changes quickly in warm light, and the best part of the weekend may be doing less than the map suggests.