One of my neighbors rides his bike to work...across Puget Sound's ocean waters. He teaches at a college within sight of Bainbridge Island, but an 80 mile round trip drive by car.
What to do? Commute across the water, in his case with a HydroBike.
Bob Barrett and Nat Hong are both happy with their ocean bike commutes, for reasons of health, fun, and resource savings. I'm jealous that they get out on the water every day, but then I do my commute in bunny slippers so I can't really complain.