I just mentioned this in another post, but if you go to the Southern California Gray Line Bus website, they sell park tickets to Universal. The bus picks you up at your Anaheim hotel, drives you to Universal, then picks you up at Universal and takes you back to your hotel after your tour is over...
Although if you wanna do something fun. I would suggest looking into the Grayline "Universal Deluxe" tour. You spend the entire day at Universal studios, and then as soon as the park closes you get back on your tour bus, and it drives you around Hollywood and stops at some of the coolest places before you are driven back to your hotel...
Melrose Avenue, Santa Monica Boulevard and Sunset Strip, home to such trendy spots as the Chateau Marmot Hotel, Whiskey A Go Go, House of Blues and much more! A stop at Hollywood Boulevard, offers time to explore the stars on the Walk of Fame and the foot and hand prints at Mann’s Chinese Theatre. Top off your evening with a quick photo stop at Downtown LA’s beautiful music center including the Disney Concert Hall.