If you only have a short time in Lisbon, definitely take a trip on one of the trams - you get to see a lot more and can decide where you would like to visit further.
Old ones run in the old town of the seven hills, and new run alongside the river.
Updates
Watch out for pickpockets - I know EVERYONE says this, but I used to live in Lisbon and I saw it happen time and time again on the 28 and 15 trams. - Especially by the ticket machines on the new 15s.
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