Ensure that all members of your party have adequate experience and conditioning to complete the trip you've planned.

Be prepared for variable snow and weather conditions. 

Carry adequate food, water, clothing, and survival equipment commensurate with your activity.
******Please print out the attachment below and make sure to familiarize yourself with it's contents.******

Unlike a commercial nordic skiing center (like Bear Valley Cross Country Center), or a more manicured nordic location on public lands (like Yosemite's Badger Pass area, or Stanislaus National Forest's Lake Pinecrest area), Lake Alpine is a wilderness environment.  Most trails require some ability to orient yourself in the woods beyond merely relying on trail markers.  Carry a map and compass, and know how to use them.

While Lake Alpine Nordic Ski Patrol seeks to make skiing safe and enjoyable, patrollers cannot be everywhere at once; be prepared to get yourself out of anything you get yourself into.

Do not ski on the lake!  Although a tempting shortcut, Lake Alpine is an active reservoir, and does not freeze into a stable ice layer.  Furthermore, sometimes water is released from the dam, leaving an air pocket between the ice and water.
Lake Alpine Nordic Ski Patrol,
Feb 9, 2011, 9:36 PM