By Diane Rommel It’s as inevitable as day turning to night turning to dawn: After 30 minutes of Winter Olympics coverage, we ask ourselves: But … could I? For all of us armchair Olympians with Whitney Houston singing somewhere, quietly, in the back of our minds —plus anyone who just wants to get super-good at figure skating — there are options across Northern California. Biathlon? You’re heading to Donner Pass. Ice hockey? There’s a fantastic program in San Jose, even for newbies. And if you want to try out some of the more exotic sports — like luge and skeleton — we have options, but you’re g…