I would do a google search and find one that does Hollywood Blvd, Griffith Park observatory, Hollywood sign viewing, maybe go past star's homes, and then do a tour of Warner Bros Studio. Very Hollywood without the crowds of Universal.
We did our own. We did Hollywood Blvd.; Griffith Observatory; and the Hollywood sign. This trip, we're doing the WB Studio Tour. We try to incorporate something non-Disney into every trip we make.