I wouldn't be too worried. Look up Argentine's defaults, it was hard for locals with bank accounts frozen but not so difficult otherwise. People will not go Mad Max on the streets although the chance of muggings will definitely increase. As for infrastructure, if you plan a typical beach holiday and drink bottled water you probably don't really need a lot of it. You need a way to get around and I bet a lot of unemployed guys with cars will operate unlicenced taxis for that, just don't get mugged by them. Ideally, it would be best to travel as a group of 2-3 bigger male friends, you should be safe that way.