Is the pacific route really that nice? I have the feeling that cycling along the coast will just be very boring.... (I'm from Holland, and over here cycling along the coast is... BORING!) ?
For what it's worth, in corresponding with a Dutch friend who has seen parts of the Washington, Oregon and California coast (albeit not by bike, yet), he states the the Pacific Coast is one of the most stunning landscapes he's seen. As stated by someone else, I think your bigger issue is the high likelihood of rain in April.