Cancun - Great place to party, but expensive
Cancun is an amazing place to party, but you have to be willing to part with some fairly serious coin if you're going to have any fun there. A night out in the clubs will cost around 70 to 80 USD, which is all inclusive, but still a hell of a lot of money to a backpacker. My advice is, if you want to have an amazing clubbing experience then go to Cancun and expect to drop somewhere around $80USD for a night out. If this out of the question then skip the place and go to Tulum and Caye Caulker.
Insider Tip:Cancun is awesome, but if you don't want to part with $80USD for a night out then you might at well be somewhere else. There are lots of far cheaper towns than Cancun that have good parties and beautiful beaches. But, although expensive, nothing is quite like a night out on the Cancun strip.