The 10 best places to travel in September

September is an ideal month to travel if you have some flexibility in your schedule.Summer vacations have wrapped up and kids are back in school, making airports and destinations noticeably less crowded.The theater and arts season launches with fresh shows and exhibitions. Plus, the weather is still warm and sunny, but most of the heat and humidity of high summer has dissipated. Everything has that newly sharpened No. 2 pencil and clean notebook feeling that makes you want to book a trip and discover a new destination.Head north, and you'll find autumn foliage dotting the trees. In wine regions, the harvest is starting. Or, if you venture to the Southern Hemisphere, you can experience spring weather, too.Here are 10 great options for a September getaway.Related: Shoulder season goes mainstreamLondonERIC ROSEN/THE POINTS GUYLondon is one of my favorite cities to celebrate the start of fall. As the leaves begin to take on an autumnal tint in Hyde Park, the Totally Thames festival rows through the entire month of September on the banks of the River Thames with arts festivals, community events, live music and boat races. One to plan around is the Great River Race Sept. 12, when more th...