Hi Duncankite, ye the big gate is mostly locked, except weekends sometimes when the model plane guys or land yacht guys are on the lake. I think to get a key you need to join 1 of their clubs. But theres a smaller gate just in front of the car park. It is always open, but it opens just about half a meter so that no motocycles can enter the lake. On a Easterly or Westerly you can just set up the kite after a 100m walk and ride down to the actual kite spot. Its about a km walk if the wind direction is unsuitable to ride.
Atm we are 4 people kiting at the lake, 3 buggies and me on the Landboard.
Would be great to see you down there someday.
PS: Dont forget head to toe protections, the lake surface is like a big cheese grater.

regards
alex