I just picked up Los Angeles Magazine's last month issue on Hikes... http://www.losangelesmagazine.com/issue.aspx?id=16928

You can get the short version of the story then look the areas online.

I would hike with you but it's going to be too hot and I had a heat stroke once so even with lots of water I won't chance it.

Let me know when you are here because I do know some people that meet regularly to do these hikes....maybe you can meet up with them.