The Ninja 500 was my first motorcycle. I liked it, and even rode it from St. Louis to Los Angeles one time. But the vibration in the handlebars really did a job on my hands, and the cross-wind effect in the high desert was the scariest thing I've ever experienced.
Congrats on the purchase. Not that it matters now, but did you consider the Kawasaki Versys? From what I've read about it, it's a comfortable and nice-handling all-rounder. It's based on the Ninja 650, but is better sorted out.