The Niederer Waldteich can be reached from Dresden, Moritzburg, or Radebeul. From Dresden, it is very easy to get there from Moritzburger Strasse. There are also beautiful forest paths directly on Moritzburger Strasse by bike.
Nice, small lake with rather little public traffic. A good place to jump in as a racing cyclist is on the east side, just a few meters from the road. However, water warms up relatively quickly in summer.