SOME RECENT OBSERVATIONS THE CASTAWAYS I honestly don't know what's gotten into a certain group of people lately. I mean is it okay to just, like, disappear?? Apparently a bunch of boys we all know and love (at least most of the time) have hijacked a very large, well-appointed sailboat and are headed into the Atlantic. It could be just another senior prank, except that half the boys on the boat are juniors. It's kind of random time to take off, especially when all of us girls could use a little entertainment. Just who do they think they are- Christopher Colombus? YOU HEARD IT HERE FIRST They have their choice of guys, but for whatever reason, models can't get enough of guys with guitars. Rumor has it the latest couple of the moment is a certain blond-haired Fifth Avenue-dwelling senior girl and the lead guitarist from the Raves. How, when, and where they met is a complete mystery, but talk about a perfect couple! TO GAP OR NOT TO GAP? Don't even try to pretend it was someone else: I saw you sneaking into the Gap on Eighty-sixth and Madison and actually trying on a plum-colored Juicy Couture terrycloth zip-up hoodie in the kids' section. Okay, I'm a snooping bitch. But the reason I'm ratting you out is I tried the very same hoodie on, and, unlike you (although I know you wanted to), I bought three of them! Why not? They're cute, and we're going to need lots of terrycloth cover-ups to wear après le pool this summer. Plus we'll probably spill Campari or crème de menthe or something equally devastating all over ourselves, so we'll need more than one. Besides, terrycloth is terrycloth, and what better way to show off your white new jacquard Gucci bikini than with a cute plum-colored hoodie? Think of it as a get-out-of-jail-free card: you're still not allowed to buy jeans there - heaven forbid- but you can now have my permission to purchase certain necessary items at the Gap. YOUR E-MAIL Q: Dear GG, Are you ever going to tell us............