I have a few suggestions, since you’re in the bay area.
I know that Save-A-Bunny in Marin does house sitting. http://www.saveabunny.com/
I’ve also used The Bunny Hay Loft, but I would call rather than email. bunnyhayloft.com/sitting.html Diane also sells hay from oxbow and other companies too.
The Former HRS group, now called Burrow Inn also does bunny sitting http://www.rabbit.org/foster-homes/burrow-inn/Our%20Services/index-Our%20Services.htm
Rabbit Haven does pet sitting too, but we’re pretty far south from you.
Rabbits can travel by plane, but it can be stressful. Many airlines don’t allow rabbits – but I know Alaska / Horizion and Continental do. It is essential for the bunny to be with you and not in the cargo hold. Most airlines only let a limited amount of pets per flight, so you’ll need to call and book ahead.
HRS has a pretty long article about flying with bunnies that should be helpful too.
http://www.rabbit.org/journal/2-12/to-fly-or-not-to-fly.html