I think over the years quite a number of skiers and boarders have bought the farm on the steep slopes of Castle Peak. Actually, there have been fatal avalanches on Andesite Ridge, which is the moderate thing to the left of the jeep road. It does not take a prominent peak to make a fatal avalanche.
Now, where it gets interesting is when you head north from Round Valley and keep going. You get to descend into Paradise Valley, then ascend Mount Lola.
Castle Pass is kind of a pain to get up and over if you are a beginner.
Oh, and for the Sno-Park lot, I don't think that they tow you. I think they give you a big ticket, like around $100. Since the daily permits are only about $5, it just isn't worth it. It used to be that Boreal ski area would let us park in their lot, for a price, but that was years ago. That is a good place to go for Ski-Orienteering.