METEOR SHOWER POWER: The Perseids are returning, as they do every summer around this time, on Aug. 12 and 13. Where to watch them? One of the trade-offs of city life is that the night sky can sometimes look like day. We're grateful, then, that we live close to several fine spots from which galactic spectaculars may be viewed. HERE'S ONE: You probably think desert for a meteor shower; we usually do, too. But the Sequoia National Park has suggested itself as a prime location. We're picturing the big trees framing the sky, and, through them, way over ahead, meteors. Yes. Now that is spectacular.