Canter. Jog. Trot. Okay, ready to really run? This is the path of South Florida marathoners: from Parrot Jungle north along Red Road to the footbridge, then east to Old Cutler Road, north a few miles (yes, a few miles) to Cartagena Plaza, then east almost to the water, north through Coconut Grove. Take a deep breath and follow Bayshore Drive to the Rickenbacker Causeway. The route is refreshingly scenic, backdropped by some of South Florida's most regal architecture and splendid flora, including air-cleansing and gorgeous banyans, ficus, and royal poinciana. The course is competitive, but there are enough drinking fountains to keep everybody hydrated. The best time to go: early Saturday morning, when the kind souls at FootWorks prepare icy coolers of water just northeast of Cocoplum.