Don, I don't know if it is still there but there used to be a really good steak house in Glendora called Pinnacle Peak. It is one of those places where if you wear a tie, they cut it off and pin it to the wall. The food was really good, but I haven't been up that way in years.
Also for some killer pastrami if you get a chance to go to a place called the Hat. I know there is one in Fullerton and that is just a short hop down the 57 frwy.
It's supposed to rain here sat, sun, mon, & tues. Weather has been low 60's day and high 40's to low 50's at night. From what you are leaving that is a heat wave!
Have a good and safe trip!