not really. I owned a light-sport plane for ~ two years. It was a great airplane, and cost about $20/hour for fuel to operate (and cruised at about 110 mph).
However, the tie-down was about $1500/year; insurance was about $2k/year; and maintenance was about $2k/year. These are the fixed costs -- $4500/year (call it $5K since I'm forgetting stuff I'm sure). Flying 100 hours/year == 100x $20 = $2000 + $5k fixed / 100 hours == $70/hr "real operating costs).
I can rent a much more capable plane (Piper Archer) for $120 per hour, and not have to worry about any ownership issues.
In addition, you can't just run up to Tahoe (at least you can't plan on it). I'm also in the SF area, and fly out of Palo Alto Airport (great place, btw). I've been to Truckee / Tahoe many times in small planes & the trip is great. But don't book a hotel, tell the spouse and make other arrangements assuming you're going to fly up -- what if the weather is bad? What if the weather is marginal? Do you go then? The moment you get into thinking along those lines, you're dead (usually literally).
Owning a plane is about having something that is _yours_ -- a plane where I know the condition and use of every last radio, instrument, wheel and bolt.
All that aside, I strongly recommend learning to fly if you're at all interested. I have been lots of amazing places, seen fascinating things, tested my skills, and once bumped into Clint Eastwood :-). I'd be happy to mentor anyone interested in learning -- http://projectpilot.aopa.org/projectpilot/
edit: formatting