In almost every place I have visited I took the opportunity to buy the Hop on and off bus tickets. Depending on where you go the prices will vary, however even if you only plan on using them for one day, by the way usually you can get a deal for a two day pass. You can get a much better idea of where things are in the place you are visiting. I usually allow the first or second day for this as it allows for a game plan to be created and I work better visually seeing a place and deciding if I want to spend more time there. Another reason the buses are great is you may see a place that is not on your list of sights to see, but once you see it can be added. I love visiting open air markets, and I have been lucky enough to find a few while ride these buses. The other nice part of the buses is that it could be cheaper to get a two day pass and get from point A to B and even maybe C verse a taxi. The hop on and off buses also often provide audio information about the sights it is taking you too which can be interesting and useful. So my advice is at least look into how much the prices are for the place you are visiting. You may be able to get them cheaper online prior to arriving at your destination.