Fresh tires are a great idea.
While it's in the shop have them verify the coolant mix is good to -30F and that the windshield washer fluid is WINTER MIX. Hopefully they have winter mix fluid in LA.
Don't forget that even those of us who live where it snows have to be re-introduced to driving when it's slick. So consider taking 10 min to practice sliding in a parking lot if it's convenient.