Wendy's son Charlie, 22, just spent a semester abroad in Sydney traveling to every state in Australia (at left, he's with a quokka on Rottnest Island).  Now he's backpacking through Asia before a summer program in environmental design at Berkeley, and then it's back to Vanderbilt in Nashville for his senior year.  His travels in 70 countries have left him with plenty of advice for parents looking for a trip to thrill their kids and teens. He started his own travel blog when he was eight. Favorite WOW Travel Moment: Jumping off the Sky Tower in Auckland, New Zealand.