Carris (main transport operator in Lisbon) offers city tours on open-top buses. €14 each hop on/hop off (every 40 min) tour valid for 24 hours so you can start any time of day/evening and valid for other forms of transport too on day of purchase. They do a circuit of a route marked by set stops and give a commentary of points of interest via headsets.
Other tours including trams are not on/off but 1-2 hours in duration. €17
Most city bus/tram tours including Aerobus (airport to city) for 48 hours costs 30€.
Save a lot of time and money and buy at the aairport (at the post office) as many passes are not on buses and only at metro stations.

Starts at Praca do Comercio at the bottom of town near Information centre.
www.carristur.pt

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