There are several excellent rental agencies in Belize City. I agree that Thrifty is good. So is Crystal and others. I personally prefer Budget. (You'll find Budget is also the preference of several other guidebook authors covering Belize.) I've rented with Budget for about 10 years and have always found their operation to be professional and the folks who run it to do exactly what they say they will when they say they will. It's a high-quality operation, and since the same family also owns the Suzuki and Mitsibushi dealership their vehicles are usually low mileage and in top condition.
--Lan Sluder
Belize books and publications by Lan Sluder:
Belize First Magazine (
http://www.belizefirst.com)
Fodor's Belize & Guatemala Guide (new 4th edition coming this summer)
Adapter Kit: Belize (the first and only comprehensive guide to living, retiring, working and investing in Belize -- a best-seller on Amazon.com)
San Pedro Cool (the first and only visitor guide to Ambergris Caye)
Belize First Guide to Mainland Belize
UpClose Central America
Belize Book of Lists