Why wouldn't you go on vacation and get a different provider?
Here's an attempt at a better (and less uncivil sounding) answer to the part of your question above: I only take a provider on vacation with me if she is someone with whom I have an established relationship and whose company I *know* that I enjoy A LOT in and out of bed. By contrast, if I wait until I am at my destination to look for a p4p partner, there is a considerable risk that I will end up with someone, or a series of someones, with whom I have a mediocre or worse, possibly much worse, time...thus spoiling my vacation or part of it.
Maybe I am hard to please, but the chance I will really hit it off any particular provider the first time I see her is surely no more than 50-50...even with the guidance of online reviews and so forth. So, if I wait until I get there to find someone, it is a fairly big risk.
-Ww