For most of my early life, I never thought of Memorial Day in terms of remembering the dead. Memorial Day was, in my untroubled youth, simply the celebrated beginning of summer: time to polish white shoes, iron the seersucker suit (there was always a seersucker suit), dig out last year's shorts and sandals, stock up on suntan lotion and get ready to soak in three months of sun-filled days and moonlit nights. When I was even younger, Memorial Day meant that the amusement park at Nantasket Beach and the drive-in at Neponset were finally open. But what you see depends upon where you're standing and what you're looking at. ..