There are many possibilities why she knows that the saloon is good and that a man saloon. She might have visited it, she might found out about the saloon on the internet, her friends have suggested it, there is an add about it and she comes to know about it so better to ask her why she knows that it is a good saloon for men and how she comes to know about it and hear what she has to say.
If you found anything suspicious then confront her but if she has a genuine answer for this then you should not blame her for anything. Moreover, you do not have any evidence that she might have done something wrong so give the benefit of the doubt to her as this is a very sensitive issue that may derail your married life so handle to smartly.
Make sure that you do not over analyzing things. Has she given you any reason that makes you worry about her loyalty? Sometimes we predict the worse thing but in reality there is no such thing. If I were in your place then I would not blame my wife for anything just because she gives me an address about the saloon but I would have definitely asked her how she came to know about it.