Regardless you win or lose during vacation, it will end in bad.
When you win, you will be happy, but you will keep thinking about your gambling instead of the vacation. Then, this will make you have superstition, you will win gambling during vacation, so you will try it again when you're in vacation.
When you lose, we're all know the effect.
Yes, we will not enjoy our vacation because we lose from gambling which makes our moods also change. We should know that we don't have a big chance to wins even if we are in our vacation. So we must control over ourselves by not playing gambling while we are in our vacation to avoids the changing of our moods. It is better we enjoy our vacation and focus to have and and relax with our families. We can prevent the losing money and can use the money for the right things.
It's true what you said, by going on vacation sometimes we can get new ideas about things that are burdening our minds, this is real because I myself felt it when I ran out of ideas to promote my previous job, I admit that at that time I was stressed, and I asked my boss to go on vacation and during the vacation a new idea came up that made me able to promote my job interestingly and it is true that the results can attract many people to visit the coffee shop where I work.
Maybe it's okay to gamble during the holidays, it's just that I don't think everyone does that, even with people who like to gamble, there must be some who don't gamble during their holidays.
Now the problem is the fear that there will be a desire to recover losses, because when that happens, what will be done is to continue gambling and slowly it can affect our feelings and the atmosphere becomes more messy, unless you promise not to do it continuously, whatever the results, it might not be a problem.
That is why we should enjoy our vacation and use it to relax ourselves and release the stresses. We don't want to comes back to our daily routine with a frustrate and stresses because we lose our money by playing gambling when we are in our vacation. That will makes the situation worst and we can not enjoy our spare time and release the stresses. We should remember that playing gambling can gives us the losses so when we lose, we may change and that will makes us in a mess situation which we can not handle.
But that will depends on each people because they should know what they need to do while they are in vacation. It is better they let them free from gambling for a while and just enjoy their spare time and have fun. That will helps them to enjoy the vacation and comes back to their home with a refresh minds.