Like with any meteor shower, it's important to get far from city lights to get the best viewing experience. You want to watch the display in a dark, open area. (EarthSky has a handy tool for tracking down quality places to stargaze.)
While the shower is named because the meteors appear to emanate from the constellation Gemini, you don't need to pinpoint the constellation to find the meteors. In fact, looking directly at Gemini will only show you the handful of meteors that don't travel far. You should look slightly away from the constellation for the best viewing.
As Cooke points out, the weather is a major drawback for the Geminids. It's one reason August's slightly less spectacular Perseids are more popular. So, if you decide snowy fields in the middle of the night aren't your cup of tea, you can catch a live stream of the event through organizations like Slooh.