Try to limit cars to the number needed to transport everyone in reasonable comfort. Excessive cars cost money and have an unnecessary impact on the environment. Park only in defined parking spaces, and in locations which do not obstruct others. Stay on roads, and do not drive on roads that are closed to private vehicles. If the condition of an access road is such that driving a convoy of vehicles on it would cause damage, do not try to drive to the very start of the trip, but park and walk or ski to minimise damage.