Trip to Temecula
We moved to the general area about five years ago and have visited quite a number of places.
The one dinner place that I would not miss would be Gourmet Italia. I know that it's not Chowhound, but you might want to check it out on Yelp. Place is truly amazing.
For breakfast you may want to check out the Swing Inn in old town Temecula. Huge homemade cinammon rolls and good food. Always busy, but quick service.
The other place that I would suggest is the Rainbow Inn. It is located about 15 miles south of Temecula off the 15 freeway. Great for breakfast, lunch and dinner.
If you are looking for something specific, please post more info.