Just a word to the wise traveler doing their research before booking car rentals in Costa Rica, where I just returned from. Here are a couple warnings I wish I'd known about before renting a vehicle in the country for about 2 weeks:
1) The rental car companies, even the brand name ones, do not respect reservation prices. I spent an hour getting upsold by Hertz in Liberia where they tried to sell me every imaginable type of insurance. They even made me get my credit card company on the phone to explain their CDW insurance. After trying steadfastly to sell me the third part liability insurance for an additional $170USD they finally caved in and gave it to me for $2USD extra. TWO DOLLARS! So, stick by your guns and don't give in to that BS. It's pure profit for them so they have the ability to negotiate down to almost nothing.
2) WATCH OUT for the currency tricks they play. I booked my car rental in USD, it was reconfirmed in USD (after the insurance shenanigans), when I returned my car the final invoice and receipt was spelled out in USD. Then, when they went to charge my card they did so in Costa Rican Colones at a completely arbitrary (and one-sided) exchange rate - which happened to be 550 colones to 1USD (the international exchange rate that day was 495 colones). So, any quotes in USD are completely useless if they decide to charge you at the very end, likely when you have to get to the airport and don't have time to argue, using a completely profit driven and arbitrary exchange rate.
Watch out. These car rental companies are independently owned franchises of well known American companies and don't play by the rules. Elite status isn't respected and they *will* try to nickel and dime you. So, get everything in writing, confirm the price in both USD and the local currency and use a credit card that will help you sort through any BS after the fact.
I was glad I used Amex as they quickly credited me back for the BS currency conversion rate.
Other than these shady car rental companies you'll LOVE Costa Rica.