I've never snowmobiled before, but I've ridden off-road vehicles and jet-skis many times. I'm heading to West Yellowstone the first week of January. 500+ inches of snow a year...I know to respect that. What sort of things does a newbie like me normally forget? I've got sunscreen, snow glasses, a GPS..the normal stuff. I'm planning on riding a total of 4 days. Two w/guide, two without. I see from other post a backback is essential, got that. But seriously, I have been reading aobut avalanches in the area so my question is...how dangerous is this going to potentially be? I'm adventurous, but not stupid either. This should be a wild vacation. I'm stoked!