I just returned from my trip. I had a nice time. I had already seen a lot of the tourist stuff in the city of LA on a previous trip in 2000. My uncle lives in Rancho Cucamonga, which I must say has the stupidest name of any town I've ever heard in my life, but is actually a rather nice place. I wouldn't mind living there myself. Many of the nearby towns aren't so nice though.
Here's what I did:
Saturday: Flew in. Saw Victoria Gardens. Went to Pasadena at night.
Sunday: Went to Temecula to go wine tasting. Good tour of the Inland Empire. Drove halfway up a mountain near Rancho at night (it got dark and we chickened out).
Monday: Went to see Redlands and Loma Linda. Went to Hollywood and Highland in the evening.
Tuesday: Took the train into the city. Went to Hollywood and Universal City.
Wednesday: Took the train into the city. Went to Little Tokyo and Beverly Hills (which was a bitch to reach by public transportation. As you go from train to subway to bus, the crowd gets increasingly shabby, from office workers to hot and sweaty non-English speaking Mexicans.) I would not recommend riding the bus in LA.
Had a nice time overall. I like the desert and mountains, and the air is good for my allergies. Would possibly like to live in Inland Empire in future, if not for high real estate costs.