Not only is Big Bear's altitude high enough to cause altitude sickness, if you're coming from Los Angeles, the beach or other parts California, you're accending very fast to high altitudes from sea level. This can further worsen altitude sickness.
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Big Bear is 6,732 feet above sea level, and the air is thinner, the weather is cooler and the pace is decidedly laid back.
Warm clothes are a must!Layer up with thermals and sweaters or hoodies. A warm, waterproof jacket and snow pants are also best for snow play or sports. Snow boots and thick socks are great if you plan on snowshoeing or tubing. Also, be sure to protect your hands and ears with gloves and hats.
Big Bear Lake was a mecca for gold mining before it was a popular four-season resort. History records show that in 1860, a bear hunter named William Holcomb discovered gold in the area now called Holcomb Valley. After tracking a bear's blood trail to a creek, he found gleaming flakes of gold in the water.
Do Not Hike/Bike/Camp Alone (especially at night) Be Aware Of Your Surroundings At All Times. Know Where You're Hiking/Camping and Let Others Know Where You Are.
The other route is through the high desert, Victorville and Lucerne Valley area, from Hwy.15 to Hwy.18 and up the “back way” to Big Bear. This is probably the safest bet to eliminate traffic and less mountain driving.
Winter coats, snow boots, hats and gloves are a must. Snowfall in Big Bear can be unpredictable at times and the night time temperatures drop quickly. Big Bear has plenty of stores that specialize in winter gear. Update your wardrobe before you go home so you will be ready the next time you visit.