What fits into one day
Choose one major palace and one nearby garden or historic-centre stop. Trying to cover every headline sight usually leaves too much of the day in queues and local transfers.
Getting there
Rail is the practical starting point from central Lisbon. Check current departure details and timed-entry requirements before setting out.
Plan the day
Book the sight that matters most first, then build the rest of the route around its entry time. Hills and traffic make extra transfer time useful.