I introduced my 6- and 8-year-old to New York City over a long spring-break weekend earlier this month. New York holds a piece of my heart as I lived there for 4 years in my 20s, then worked for a Manhattan-based organization that brought me back to the city several times each year in my 30s. This week, I invite you to (vicariously) experience this short journey with my sons and I that will enhance …