MRSA is not a disease. MRSA stands for methicillin resistant Staphylococcus aureus and refers to bacteria living on one's skin. Normal skin has bacteria which lives on it and doesn't cause any problem. This is usually a combination of Streptococcus and different types of Staphylococcus. As long as one doesn't have any symptoms from this (i.e. recurrent boils or cellulitis) it is not an issue.
Generally, if someone who is otherwise healthy is exposed to MRSA, one's normal skin flora will "outcompete" it and it won't become a problem.
Being colonized with MRSA is something that millions upon millions of of people in the US and around the world are, and if not causing a problem, there's no need to worry about it. Even with MSSA (MRSA's less antibiotic resistant cousin) you can get skin boils and there are even MORE people colonized with this.
My advice? Go on the vacation and don't even worry about MRSA. It's not a "disease".