This fast-growing metropolis has a youthful energy that permeates the lively downtown full of shops, restaurants, parks and museums along the St. Johns River, America's longest north-flowing river. Mild, sunny winters and long, clean beaches attract people year-round, as does the "lost in time" ambiance of Amelia Island, the southernmost isle in a chain of Atlantic coast barrier islands that stretch from North Carolina to Florida. Jacksonville combines the charms of Old Florida with modern beach resort delights to please everyone from history buffs to families to outdoor enthusiasts.