Lisbon works best when breakfast starts early and dinner is not rushed. Keep the first day simple: coffee, a pastry counter, and a seafood lunch near the water.
The second day can carry more movement. Put one market visit beside a neighbourhood walk and leave the evening for a booked table.
On the final morning, buy gifts that travel well: tins, chocolate, coffee, and small pantry items. They are easier to pack than fragile ceramics.