Well, of course I do just happen to live on the AZ/UT border ... the greatest part of the world to ride motorcycles. In fact, I'm fairly certain the whole reason motorcycles were invented was because driving a car through this part of the country with windows rolled up is just plain lame.
But I'm not biased or anything. :-P
As to when, if I end up working for the park service, they might call a moratorium on any vacations at all like they did last year (pussies). If not, Spring/Early Summer and not on a holiday would probably be best for me, as if they don't put a stop to vacations right away, they will by mid-Summer.