Quoted:
I thought about hitting the beach but it wouldn't be the same without the wife with me.
Any suggestions?
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You're right it's not the same, you will be able to gawk as you like without wife complaining.
Seriously though, what interests you?
Hollywood is interesting because it is so small and dirty and full of immigrants. Probably the exact opposite of what people imagine. No movie stars, just broken dreams and freaks.
The beaches are beautiful if you are not used to them.
Joshua Tree is not far but it will be HOT. Same for Palm Springs. If you do head to jtree you can drive another 45 minutes and visit the Patton tank museum. That's a lot of desert though.
the Aquarium of the Pacific in Long Beach is nice, and the Iowa is close by. Those will make for a day.
The March Air Reserve Base has a nice museum. In Chino the Planes Of Fame museum is really nice. Good one in Palm Springs too.