Battery Park by subway: take the 1 train to the South Ferry station, 4 or 5 train to the Bowling Green station or R/W train to the Whitehall Street station.
For American Museum of Natural Hisotry: Take the B (weekdays only) or C to 81st Street
For American Museum of Natural Hisotry: Take the B (weekdays only) or C to 81st Street