The Underline is an ambitious plan to convert the path beneath the Metrorail into a ten-mile linear urban trail, designed by top architects and urban landscapers to be Miami's answer to New York's now-iconic High Line. But anyone who has run on the curvy trail today knows it's already great. The Metrorail's tall infrastructure casts a cooling shadow on the trail, and whizzing trains send a steady breeze down while your feet hit the pavement. Sea grape leaves and rock doves line the path beside you. And for now — before the starchitects and the glowing national media move in — it's a relatively seldom-used trail, making it perfect for a late-afternoon jog. Traffic rests at a stand-still along South Dixie Highway, but you're flying by. From Coconut Grove Station on SW 27th Avenue north to Brickell Station, it's a three-mile jog. And on your way back, you can treat yourself to a cafecito or craft beer from El Carajo — or simply take Metrorail back if it's that kind of day.