I like Hollywood if you are into movies and all. Universal Hollywood is much smaller with a great backlot tour. Also, the Warner Bros. studio tour is pretty great - small groups and can be different every time depending on what is filming where. Lots of classic movies were filmed there and they have working tv show sets too. You could be in a studio audience, but it is time consuming as I understand it. Maybe go see a taping of The Price is Right - which now is in Glendale I think (used to be right in the heart of Hollywood). The Walk of Fame area can be hit and miss - it can get sketchy. You will see some characters, that's for sure - and I don't mean the ones in costumes in front of the Chinese Theater!

I'd say it's generally safe during the day though, but it's interesting.
I am not much for the beach, but there are plenty. They can be busy though! You also might see some "characters" on some of them too - could be good people-watching.
Definitely get you some In-N-Out and well-done fries and enjoy LA. I also recommend Ike's Love & Sandwiches - great bread (Dutch Crunch) and lots of options! Enjoy.