The cousin-from-Camden contingent has arrived, half a dozen nippers in tow, and by day six, you've stage-managed everything from airboat rides in the Everglades to daytrips to Disney. Worse news is in store: Your loud-mouthed sister-in-law has dropped in for a surprise inspection. Drastic times require drastic measures, so raise the salty old ghost of Cap Knight. Cap's Island Restaurant, which is set in two 80-year-old buildings on an island at Lighthouse Point, can be reached only by ferry. And it boasts enough nostalgic charm and locally caught seafood to stifle the in-laws -- at least for as long as it takes 'em to down a glass of chablis at the hand-built bar, peruse a couple of hundred old-Florida photos, and read all about how Cap and his wife ran a gambling and bootleg rum operation on the premises. If you still need a little distraction, introduce them to the Knight family -- a sister and two brothers who still run the place. Then all of you can polish off a plate of broiled dolphin ($24.95) and a slice of lime pie ($5.95). Sate them with histories, stuff them full of house-made fish dip, and for pity's sake, send them home on the next 747.