"Standard" mode and don't boost exposure too much to compensate, as you would normally. The GH1 does meter quite well off sunlit snow and if you open up to compensate, you'll get blown highlights. At least that's my experience. Take a Circular Polariser out with you too.
Standard is one of the film settings, which can be accessed by the rear button on the top panel of the camera. iAuto is the mode you choose on the top control dial and puts the camera in auto pilot.
