I went on this Universal/Hollywood tour in June through Grayline. It was called the Universal Delux package I believe. That was definately the highlight of my entire trip. Grayline bus picks you up at your hotel well before the Universal park opens, it (Takes you to the bus loop where you grab your next bus after getting your park pass things for your enitre party, then you take the next bus to Universal for park opening.You spend all day opening to close at Universal, then the same bus you took out to LA will drive you around Hollywood to the Chinese theater, Sunset Strip, Walk of Fame, they show you celebrity houses (including Johnny Depps

and Drew Barrymoore's). You go passed the Disney Concert Hall, go to a Farmers Market, then make a stop at the hall where they host the academy awards every year. You can walk around their fountains and everything. There is loads more but you get the idea.
Then the bus brings you back to your hotel in Anaheim.