We went mainly to see the Museums. The Mauritshuis, Gemeente Museum and Escher Museum are really worth visiting. Tram travel is easy (best to get either a day ticket or a "chipkaart" which you charge up with minimum €20 and use for trams and also trains). Walking is pleasant in lots of different types of areas. If you're there for any time, it is worth going to Delft and/or Leiden which are easy to get to. The nearby area of Scheveningen has a beach though we didn't go there. I strongly recommend the "Ulmon" ap for map of the city (and any other city).