Great suggestions above.
I would also say- can you google map a bicycle route? Click on the bicycle and it will take you the best way via bike (although sometimes they goof and put you on terribly busy roads anyway).

For a couple years I worked 27 miles away from home. I rode my bike only 3 times in two years. It was not only really far, but I had to ride in the dark through some sketchy sections of town and had to ride on some crazy busy roads. If you can do a park/ride option that might be best.