drive safely. no trick

u can use your own insurance(call ur company to confirm) to cover liability and use a master/visa platinum to cover CDW/LDW(call ur cc to confirm).

Hertz is No.1 for sure but it can be more expensive.

but u can find some coupon. search rentalcars, or use google.

good luck.

if u don't completely understand what I am talking about. You can go to mitbbs-> travel board and search 租车. you will find some useful informaiton.