Park the car for the day and get on Miami's billion-dollar transportation boondoggle for a self-guided tour of the city. You can enter a station at any point along the 21-mile convex curve from Hialeah to Kendall. You'll travel a crazy parabola through neighborhoods as different from each other as the people are in this highly stratified society. The views are by turns breathtaking and depressing on the journey through Hialeah, Brownsville, Allapattah, Overtown, downtown Miami, and the Brickell area, then south along Dixie Highway through Coconut Grove, Coral Gables, and South Miami. Then jump to the Metromover downtown for a photo-worthy whirl above the Miami River and the pulsing streets of the center city, catching occasional glimpses of Biscayne Bay. Metrorail's history is one for the books. Voters approved a bond issue to build it in 1978, but plagued by cost overruns and construction delays, the complete $1.3 billion elevated train track wasn't open for business until 1985. And it hasn't exactly done much to relieve our ridiculously congested roads; only a tiny percentage of Miami-Dade's population actually uses it. Still we like Metrorail (or Metrorail, as its detractors lovingly call it). It's as much adventure as you can have for a pocketful of quarters.