Hi cybie and Nami,
Not sure if u guys will want to consider taking the contiki land tour. They have a 10 days from USD $1039 per pax tour (LA to the Bay) that features California, Arizona, Nevada and Mexico
Tour the great cities of the American west - San Francisco and Las Vagas - and the region's marvelous natural wonders - the Sierra Nevadas, Yosemite National Park and the Grand Canyon.
I have travelled with Contiki when i was touring Europe few years ago. The best parts of this tour operator is that its for young people from 18-35 yrs old. That means the tour is packed with fun activities and no short itineries to cater for the old people.
They will normally bring you to some places and have arranged some sightseeing and give u half a day to roam around yourself before embarking to the next destinations.
So its a guided but still have time to roam around urself tour.The best thing is you do hv to worry about the transport and accomodation as its all included.
For more infor u can go to the below link to take a look.
http://www.contiki.com/en-PH/Tours/America/LA.to.the.Bay/Itinerary.htm
All u need to do is to pay for ur own air ticket to US and some of the meals and optional tours. An ideal tour for US 1st timers.
As for me, I will be also going to LV,LA and SF and a cruise to the southern islands of Caribbean. But my hubby is a frequent traveller to US, will be driving to these cities. Probably if u guys are adventurous, can consider doing so.