Originally Posted by valygrl

To add a little more, which route and which direction is the best depends on what kind of scenery you like, your tolerance for dogs and the time of year you want to do it. Do you have a time of year or a time constraint?

Also, you don't have to go coast to coast. Personally, I wouldn't go any further east than Denver. But that's just me, I can't stand the flat riding in the plains states. If you have 1.5 months, you could do the pacific coast. If you have more and you can start in May - June, you could make a big circle from San Francisco to Colorado, up to Montana (or go to Canada and ride the Icefields Parkway), then back through ID/WA and then down the coast to SF. ANyway, lots of things to do, coast to coast might not be the best ride, if you don't care about saying you rode coast to coast.