I have visited many cities in Europe and the USA, of which most large tourist cities have a City Sightseeing bus.  The bus in the picture is in Rome. The fee is worth it if you don’t know the city. Jump on and see the city and listen to the commentary, which is either via headphones that are provided or via speakers on the bus with live commentary from a guide.

I suggest riding the bus all around the city to all the stops to get your bearings and then decide where you want to get off. Plus you will know where all the stops are for future boarding. You might want to get off at one stop and walk to the next. Pay attention to the timetables so you don’t get stuck on the other side of the city. Some of the buses run into the evening hours.

I was recently visited San Francisco and rode the City Sightseeing bus with a 24 hour pass. Some of the passes are for 48 hours, but that’s up to you. I was very impressed with the history and city info given by the guide on the bus. They are well versed in the trivia of their city.