more suggestion

How many people? any baby and kids?
did you consider traffics will take more time in LA and vegas, and any freeway in Southern CA will be jammed during weekend and peak time.
visiting hoover dam will take two hours, and hoover dam is 30 miles away from Strip, also strip is very busy on evening!
where will you stay in LA?
best beach for sunset is Santa Monica/Malibu Beach
New Port Beach, Luguna Beach, but depend on where you
stay, all freeway is jamed when peak time, it will
take you about double time than normal condition!
San Diego has more attractive spot than Sea World and
Zoo if you dont have kids and must go there.
Cabrillo Natl Monument, it is beautiful view for all
San Diego, Beach, Skyline, Navy Yard etc...
Be careful in Venice beach for your safety!