Did some reading, and I think there's no way to get back to our car without going back the trail, or taking the bus. Checking trip times in Google Maps, it will take around 1.5hrs by bus from one end to the other, not counting the wait time for the bus.
We are 7 in the group, so hitching a ride will not be an option. And I'm not sure if buses will have enough room to fit us all at once. So I'm thinking of walking half way then turning back towards our car. If this will be the case, from which end should we start our trek?