You can usually identify a denizen of North Dallas when he or she asks, sotto voce, "You live in Oak Cliff? Aren't you scared to live there?" Kessler Park, garden oasis from the big, bad streets of Oak Cliff, can surprise even a Dallas native. Beautifully kept $300,000 homes nestle along hilly, tree-lined streets. You can even put your SUV to use by climbing those steep street humps every few feet. But keep it to yourself. We don't want the wrong element sullying pretty Oak Cliff's prettiest neighborhood. Let 'em stay in North Dallas, where they belong.