American Airlines (www.aa.com) if offering savings on flights to Cancun, the big Mexican resort, from a number of U.S. gateways. The return air fare inlcuding taxes is as lwo as $318 from Miami, $466 from New York's La Guardia airport.
To get these fares, you have to book by August 19. American also offers cut rates on weekend getaways, with varying destinations. They can be a good hoice for a quick holiday.
I have never been to Cancun, but it is located quite close to some interesting archeological sites of the Yucatan peninsula, and is noted for its beaches.