You say you have a P&S already... what is it? BTW the S2 is technically a P&S as well, of the superzoom type.
Everything that fralexandr said is correct... if your use for the S2 is stuff like wildlife in broad daylight, then it will be a good addition to your vacation. (Because I'm assuming your P&S doesn't have anywhere close to the 12x zoom of the S2.) But for general travel photography (wide angle shots, people shots, scenery shots) a standard pocket P&S from any of the decent brands will outclass it by quite a bit. In particular, low-light performance, and also wide-angle performance. The lens on the S2 has a wide end that is only 36mm equivalent, so indoors shots, group shots, and scenic vistas will all be from a very limited POV. A modern P&S with a 28mm (or, better, 24mm) wide angle will be much more useful for those kinds of things.
In short, the S2 will be able to "zoom in" much, much more than your P&S, so if you're going to be taking photos of small and/or distant things, then it would be a good camera to have along with you. Conversely, it will not be able to "zoom out" nearly as much, so anything where you want a wide angle of view will probably be better suited to the P&S you already have.