Turning the Headlights OFF  www.r1200gs.info
The procedure is as follows:

   1. Turn the ignition on and allow the startup-check cycle to complete. The headlights will be off (this is normal).
   2. Hold turn-signal cancel switch for 4-5 secs.
   3. Hold right turn-signal switch for 4-5 secs.
   4. Start engine.
   5. Lights should remain OFF. 

Or

   1. Start the bike and the lights come on.
   2. Hold turn-signal cancel switch for 4-5 secs.
   3. Hold right turn-signal switch for 4-5 secs.
   4. The lights will go off. 

This will reset next time you switch off the ignition. The headlights will be off, but the running lights and tail light will remain on.

Note: Tim Jones says that on his '07 Adv model (without servo brakes) just hitting the high beam or passing switch will turn on the low beam again. This apparently does not work on '05 and '06 models. 

Turning ON the Parking Lights
The procedure is as follows:

   1. Turn off the ignition.
   2. Within about 15 seconds (as long as the instrument cluster glows), push both turn-signal switches.
   3. The "parking lights" will remain on until you turn ignition switch on and then off. On USA-spec bikes, the parking lights consist of the tail light and the very small light(s) in the headlight assembly. The red hazard warning light on the left handgrip will also remain ON if so equiped.
   4. WARNING: Prolonged use of the parking lights will drain the battery.

Turning OFF the Parking Lights
The procedure is as follows:

   1. Turn the ignition on, then off. Or just start up the bike and ride away.

Past Tech Sessions and Tips 

Improving Bike Visability by Archie Jay Patterson II.  Here Pat explains how he added items to his bike to make it more visible.  Click on MyR1200RTBikeAddons to download PDF File.