Editor's Note: This week's Day Tripper column sends you to Sandy Hook, for all its federal-park, lighthouse-tall, miles-of-beach wonderfulness. Take the Garden State Parkway North to Exit 109, and head northeast to Route 36 for a trip that's about an hour's drive from Toms River. Enjoy the March serenity of Sandy Hook, before it gets as crowded as our own Island Beach State Park does come Memorial Day. It may still be a little chilly for this idea, but the thought is a warm one, worth a try. The weather is actually getting nicer; and it'll still be a while before the throngs of sometimes …