Years before my kids graduated from high school, a friend shared the best advice for when your children fly the coop: plan vacations that will make it impossible for them to turn down the invitation. While it may sound like an enticement, my friend's message reminded me that shared family experiences, whether they involve lost luggage, bungee jumping, or sitting on a beach, are sustaining and reaffirming, and as valuable as laughter and traditions cultivated when everyone li