In this case, your best bet would be to advertise in a newspaper read by commuters, such as the Metro. Tailoring the advert to commuters is quite simple, targeting people travelling to work by enticing them with a cheap, convenient city break which they won't have to book time off work for. These types of holidays aren't as effective when advertised on the weekends or in holiday times (such as school half terms for families) as the urgency has gone. This method can be further improved with both market and weather analysis, advertising a warm place on a cold day, or a 'white-winter' around the end of the year. It's critical to tailor your advertisements as best as possible, and any difference can make a world of difference.
There are many different options once you have decided which newspaper and when to advertise in, with the main two being on-page print, or inserts. On-page printing is simple; adverts which take up a page or part of one within the normal columns. Inserts are generally alot more variable, as a marketer can put anything they would like inside a newspaper (with permission). These are always glossy, and range from single A5 sheets to full-blown magazines. Again, it's important to know your target before deciding; an insert doesn't work too well within a transport based newspaper, they fall out and go missing very easily.
One word of warning for all of this; beware of market saturation when advertising. Your insert is more than likely to be lost within a sheaf of other inserts, and are often overlooked when there are many. On-page printing however, is much more manageable; people will scroll past on-page adverts, but they will never be lost altogether.
Inserts work best when a newspaper is getting delivered to a residence, as the person will have to physically look through all adverts to see if there's anything important, such as an offer or desired magazine. Newspaper adverts are relatively cheap, and provide great brand awareness, if not direct sales. One caveat to these types of adverts is that the return is very hard to measure. Internet and telephone sales are easy to monitor, while an increase in foot traffic through a store from an advert can be easily misinterpreted.