Hi I'm going with my wife in the middle of may for 12 days trip from San francisco -Elko -Twin falls-Yellowstone- Bryce-zion -Grand Canyon-Las Vegas-Los Angeles and back to San Francisco. My question is- is it enough time to see all of this beautiful places and what exactly we should focus on.Are there any good and cheap hotels near Yellowstone,Bryce and Zion Park? Thank You for all suggestions and advises...