for driving direction, use streetdirectory.com or Google Map.
car parking, there is a open air parking space near the road end, it belong to Outward bound, read to sign before you park.
you can take a cab there, just tell the cab driver you want to go Punggol Road End or Punggol Jetty. when you leave, you can take a bus to Punggol MRT station.
Hope this help.