I was thinking the citrus trees around Orange Cove might be blooming, but I haven't been there recently. The ride over the Grape Vine should be nice anyway.
If you go next weekend, the drag races are on at Famoso Raceway. I'm pretty sure they have everything from turbo imports to motorcycles to nitro funny cars racing that weekend. There is some rain schedule the Wed-Thurs before, though, so no telling what the weather will be.