Assuming flight in is on time then perfectly possible to get into town but you won't get time to see much. Did it myself a while back, early AM arrival ex ATL, got to centre, everything closed. No romance in my soul that day. Seriously recommend you look out the window as you land, a wet grey cold Amsterdam in March is no fun. Sunny June July August different matter. Writing sat in Schipol, Crown Lounge, Schengen side. It is wet and miserable outside so my reply is biased! Soup is nice though.