It's one thing to glance at downtown's twinkling lights while you're moving along with a stream of commuter traffic at 60 mph. It's another thing altogether to park down by the bay, cut the engine, and check out the skyline in all of its glory. The best viewing spot is a gravel lot under the MacArthur Causeway on Watson Island. Just pull off at the exit for Parrot Jungle and follow the road around to the water. You might have to share it with a couple canoodling in a Cadillac, but you'll get an unobstructed sight line across Biscayne Bay to the business district's crystal canyons, with the illuminated Port of Miami bridge in the foreground.