Drive part way and ride the rest.

or

Drive in with bike, ride home. Ride in the next morning, drive home. Do this twice a week.

or

Ride to the park'n'ride and take your bike with you on the bus. I don't remember what you might have said about bike racks on the buses.

or

Look for some other mass transit (a different bus route, a train) that permits bikes on board. This is not uncommon.

RichC