Looking for some help on a trip. Flying from Chicago area to Vegas with 2 teens. We would like to see Vegas (mostly shows and sites, no gambling). The only reason Vegas is on the list is because its MUCH cheaper to fly into Vegas than any city near it. Would like to see the San Diego Zoo and Seaworld. The walk of fame, Hollywood sign and other tourist sites in L.A. Then the giant Sequoias closest to the area. We want to go in March over spring break. How long will a trip like this take? Is March a good time to go or should we wait until summer? Is there a certain order we should go in to save time? I have never been anywhere in the area before so I am completely ignorant about the weather, mountains, desert and anything else out west. Please give me any advice you can. Even down to the type of car I should rent.