J.P.
Leave the kids. They won't have much fun doing Hollywood stuff. Sounds like you've done the big things with the kids.
Hollywood walk of Stars
Rodeo Drive
Griffith Park Observatory (cool laser show)
Some people like a tour of the stars homes
La Brea Tar Pits
Getty Center
Getty Villa ( I love this place) - you have to have reservations
Paramount Studios
The Greek Theatre - take a concert in
Chateau Marmont - have a drink - lots of stars hang here and get in trouble
Universal CityWalk
Hollywood Bowl - cool place for a concert, you'll never forget
Angel's Flight Railway
Olvera Street
Hollywood sign (near La Brea Tar Pits)
Venice Beach Boardwalk
and we haven't even gotten to OC.....
Lots of Beaches
*Do 1000 Steps Beach in Laguna Beach
Catalina Island (which might be in LA county, but you can leave from Dana Point or Long Beach by taking a ferry or a helicopter - cool factor)