Parking: If possible, try to keep all your quarters for meter parking. You'll also have to read the parking signs to see when meter parking is in effect. They are all different timings depending on where you park. If you're parking in malls or barrier parking, you might be able to get parking validation, which will make parking fees way more affordable (less $10 USD or so). There are conditions to get validation (like eating at certain restaurants, spending up to $XXX etc.) Car Rental: I've only booked Hertz, and they have been reliable thus far. You obviously need a GPS, but if you have a smartphone with data, you don't need to rent one. Reserve your car online (sign up for Hertz Gold Plus rewards - it's free, and it shortens waiting time if you're picking up your car at the airport) and pick up your car at your desired outlet. Be sure to inspect your car for damages and faults (I had to change cars once because it had a slight leak). You don't need any international or conversion license. Insurance is always a good idea. Driving: Stay away from peak hour traffic in the evenings. Traffic normally builds up around 4pm and last till around 7 - 8pm. A simple 15-mins drive can turn into 1.5 hours if the jam is really bad. Others: Don't take CDs from anyone there. They'll say it's free but they'll always expect a tip ($5-$10) for their shitty rap music. The same for fake mascots unless you really want a picture with them (Hollywood Boulevard and Venice Beach). Try to dress like the locals there and they won't really bother you that much. Get used to tipping. I usually tip 15 to 17% depending on the service. These tips only apply to Los Angeles and Las Vegas, cause I've only been to these places at the West Coast.