We are a family from Rio de Janeiro flying for the first time to Las Vegas (from 12/27 to 01/01/14) and San Francisco (from 01/02 to 01/13/14) and my kids of 6 and 8 years are desperate to play for the first time with snow. Where is the closest place from San Francisco by car that I could take them to a one or two days trip to play with snow? I have looked at yosemite park, Lake tahoe and Sequoia park at internet, but we are worried about possibly driving with snow and road conditions. Besides, kids don´t have patience in long trips. Many thanks to sugestions.