If it is like a close distance, non exotic location, I would go solo just to check it out and if it is worth it, I am going to make a second trip and she is coming with me.
However, for those out of the country experiences, there will not be a 2nd trip so she's coming with me regardless or I am not going.
Except that one time that it is a all guys trip. With that, a phone call is all I needed to forget about her.