I don't think you should be putting toward his debt....but its sounds like you aren't completely financially stable if you are considering filing BK - I mean if your plan is to file (because its his debt and I totally get that), but you have the financial means to actually pay it, then its not going to work to file.
If I am not mistaken he also doesn't meet his financial obligations anyway as far as helping to pay for the girls and their needs.
My point is if you are in a financial bind and come across some rainy day money = do save it for a rainy day.
If we are mistaken and you are financially sound then go on vacation and have a good time.