Tripping Around Westchester, NY

Westchester County is one of the more popular areas of New York State, but I have to confess I didn't know much about it before Mom and I were invited up there by some friends. Blame it on too much TV - I watched Sleepy Hollow and X-Men First Class - both set in Westchester, but as with so many media depictions of real places - not too accurate.

So what is the real Westchester like?