Santa Ana doesn't have much.  We got TONS of malls in that area.  Unless you're with family, Disneyland is a total waste of money.  A better bet is Six Flags over Magic Mountain.  The queen mary ain't much either.  We have this thing called the Block if you're part of the younger crowd.  Its got a big AMC move theatre and a bunch of stores.
We have a TON of PC cafe's also.  You could go laser tagging, go karting, or take some trips to the beach.