Four days in Lisbon can disappear into ticket queues. Two timed entries, a morning ferry and three deliberate hill walks will show you more of the city than a list of twelve viewpoints. Book the two entries for the first and third mornings, keep the middle day loose, and accept that a steep street and a tram ride cover the same ground.
Two bookings, then stop booking
Reserve the two sites that genuinely cap admissions and leave everything else open. Timed slots sell out on weekends and around public holidays, while ordinary churches, markets and neighbourhoods rarely do. Filling four days with reservations removes the flexibility that makes a hill city pleasant, because plans and slope fatigue rarely agree.
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Schedule the heaviest walking day for whenever you wake earliest. Jet lag from most long-haul routes puts travellers on the street before shops open, and that is the best window for the two steepest districts. By eleven the pavements are crowded and the trams are full, which is a good moment to sit down for a long lunch.
A tram ride and a walk are different trips
Compare the tram along the riverfront against walking the same line uphill. The tram is fast, cheap and often standing room only, and it skips the courtyards and tiled facades the walk exists for. Do one direction on foot and return by tram, which halves the climbing without giving up the details.
Actionable habit: buy a stored-value transit card on arrival and top it up rather than paying per ride. It works across trams, the metro and the ferries, and it removes the small daily friction of finding change. Validate on every boarding, since inspectors do appear and the fine is far larger than the fare.
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Sintra as a day trip needs a warning

The nearby palace town is the obvious day trip, and in high season the trains and shuttle buses are genuinely hard work. Go on a weekday outside August, leave on the first train, and pick two sites rather than four. Travellers who try to see everything there usually remember the queues and little else.
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