Air: Horizon Air, part of Alaska Airlines, operates a non-stop service to Santa Rosa from Los Angeles. Oakland International and San Francisco International are each a 1.5 hour drive from the hotel. There is an airport shuttle between SFO and the Santa Rosa Park & Ride (at the fairgrounds). http://airportexpressinc.com/
Transport from Oakland or San Francisco International Airports to Santa Rosa Park & Ride: http://www.airportexpressinc.com/ Affordable and no reservations required. The Airport Express schedule is posted on their website. Note: The bus driver will arrange for taxis to be ready for you when you arrive at Park & Ride.
Train: The Hyatt hotel is a short 1 block walk from the Santa Rosa Amtrak station which offers a bus connector from the Capital Corridor Amtrak Line.
Carpooling: If you are looking for a ride or you have extra seats in your car, take a look at this carpooling website that will help connect drivers and riders: http://www.groupcarpool.com/t/2b5c9o