Directions:
LIRR to Sayville is taken to Fire Island, a shuttle gets people from the LIRR to the Fire Island Ferries, but vehicles aren't allowed on Fire Island (except for maintenance vehicles or delivery carts).
Walking is how people get around the Pines or Cherry Grove and water taxis can be taken from the Pines to Cherry Grove, but we personally prefer to do a beach walk from one to the other.