My husband and I went to forest lawn about 8 years ago. We went originally to see Lucille ball's grave. We found it eventually with help from a caretaker. Were glad we did since they moved her ashes to newyork a couple of years ago.
We didn't even know walt disney was burried there, but there are tons of stars there. Marilyn Monroe, Liberache, Betty Davis, Hugh Hefner has purchased the plot (well actually wall space) next to marilyn monroe in case no one knew this. There were more too.
The place is huge, would reccomend doing research on who's grave you want to see before going, we didn't and it was quite a hike.
Another great cemetary in the LA area is the Hollywood Forever Cemetary. We did that one the same day. Tyrone Power is burried there along with TONS of old stars. The cemetary is really old, so the grave sites and tombstones are really interesting.