What is the best bug repellent out there?

i will be leaving on vacations to mexico in 2 weeks, and i know for a fact that there will be plenty of bugs. i wish to know if there are any bug repellents out there that people could recommend? i will be near beach, and hot weather. any suggestions?What is the best bug repellent out there?
I like a product called Bull Frog because it is a spray and also a sunscreen.What is the best bug repellent out there?
mexico?? watch out for swine flu

clarins