Check out the kashrut

This weekend someone told me about a hotel which had been advertised under the kashrut supervision of a certain rabbi. Many guests checked into the hotel becuase they trusted the hashgacha of the rabbi. During their stay, however, people learned that the rabbi had not given his hashgacha to the hotel's owner. Upon hearing the news, people checked out of the hotel, having to cut their vacations short.
A friend told me that she had experienced something similar one Pesach. A family had checked into a hotel, certain that the hashgacha was being given by a trustworthy organization. The hotel had not advertised, as such, but the family operated under the mistaken belief that hashgacha was being provided by the organization. At some point, the wife discovered that this was not the case. My friend, who trusted the proprietors, opted to stay for the duration of Pesach. The wife cautioned my friend not to tell her husband about the new developments because it would have been difficult to check out of the hotel in the middle of Pesach.
I don't believe the two hotel organizers served anything other than kosher food. They probably didn't want to pay the high kashrut supervision fees.
But, if you are going on vacation based upon an assumption that so an so is providing the hashgacha, do yourself a favor and make a simple phone call to corroborate your belief.