As always, the best way to be prepared for your pick up, is to call the actual location that you will be picking the vehicle up at. You will need to have a valid driver's license and a valid credit card in the renter's name. A valid international driver' s license may be required, in addition to your regular driver's license. If you are on government or corporate business you will need an id to validate this as well. If you have a coupon or discount you should have it at the time of pick up.
Most companies offer daily, weekend, and weekly rates.
Most rental car companies work on a 24-hour clock rental period. If you return the vehicle later than your pick up time you may be charged an hourly fee for each hour over the daily amount. Check with your rental car company to determine your hourly rate. Most vehicles fit into a vehicle class and when renting the company only guarantees that class of vehicle. It depends upon the number of vehicle options within a class.