Dee Chandler and Beau Blakemore, guides on the Gunslingers, Ghosts and Gold Walking Tours, strolled into their chosen profession as tourists themselves, so be assured: They've done their homework, though they've probably worn out more then a few pairs of shoes in the process. But it's paid off -- Chandler and Blakemore work with an arsenal of funny, gory and often creepy yarns from Denver's rough-and-tumble past. If you're a native, chances are you've heard or read some of the stories, but they're perfect fare for visitors to modern Denver, which bears little or no resemblance to the one Chandler and Blakemore evoke.