I could be wrong, but I'm guessing that you're in Corona, CA... But then again, "corona" could be referring to your preferred drink. If you really want to get those pretty 700xx's dirty, come up to my end of the state. Hollister Hills SVRA should have some dandy mud for you right about now... slick, sticky clay goop. Get them real dirty.
Yeah! They look sweet but you need to get them dirty! Used to ride outside of Murrieta and been told there's a whole lt of trails outside of Escondido, west side of town, supposedly you can find it under the BLM map.