Access is via a car/motorbike ferry which connects with Nha Be and takes only 10 minutes plus any additional waiting time.
I would recommend doing a trip here without 200 school children, not least because it means the monkeys will have less to grab. Can Gio is not monkey infested, but there is a small nature preserve housing the handbag snatchers and also saltwater crocs. 'Australia Zoo' it isn't -- we climbed off the bus to come under attack from materialistic beasts who were more interested in new mp3 players than bottom scratching, a more natural activity than theft.
I digress, pictures here are from the mud flats at Can Gio.