A lawyer will be able to go into the judge's chambers and discuss your case with the judge and prosecutor. That alone will usually get you a better deal than handling your own case pro se.
Whatever wet and reckless is is likely your best shot at a plea down. I highly doubt a prosecutor would allow a plea to public intox given the facts you put forth. In any case, an attorney is by far your best bet at getting a plea reduction.
Also, if this is your first offence, an attorney will very likely be able to avoid any mandatory jail time for you. There were no injuries, no accident, and hopefully it's your first DUI.
Regarding your license, it depends on what California's procedures are. Where I live, an OVI/DUI charge automatically triggers an administrative license suspension for 180 days. California probably has something similar, so you'd have to file a motion to stay the ALS or petition the court for driving privileges. Get a copy of your work schedule, and any other mandatory duties that require you to drive (ie, picking up or dropping off kids, etc).
It all depends on the particular judge, but if it's a first offence I'd think an attorney should be able to obtain your two goals of avoiding jail time and maintaining some driving privileges.