It's the biggest lake in Berlin, very nice spot for Windsurfing and Sailing.
Which wind direction is best: West winds
What time of year is best: from May to October
Any local hazards: no natural hazards, watch out for many turists boats
Can you kitesurf there?: Not suitable for kiting, Deep water
Links to weather forecasts for the site
WEBCAM + WeatherStation can be found here: http://www.igb-berlin.de/abt2/ms/ms_dat.shtml