By doing this your taking a splurge that technically you can not afford and could cause you more finance issues. These financial issues may taint your holiday and then instead of having great memories from a great vacation, you've a bad taste in your mouth. "I should not have taken that vacation, look where we are today" is often a cry from someone who didn't properly prepare.
Late payments are probably the biggest mistake you want to avoid when it comes to trying to repair your credit So make sure that while you are working to improve your credit you do not make any late payments or keep any accounts overdue. This can damage your already bad credit in a way that no other factor can. It simply shows your lack of sincerity and dedication to your debts. Be careful to spend in a way that you don't end up making late payments. If you cannot afford to pay the bills later on then don't buy that particular thing. These are the days that you have to keep your expenses in check as this will greatly help improve your credit.
Remember to fix credit scores for best results.
