Only Villa Etelvina has wi-fi and it's spotty, so desperate travelers congregate around a unique little machine called TUINFO stationed in the entrance to a little shop across from the main market. Place your phone directly, without a cover, where it says 'coloca aqui,' insert B$3 and grab a seat on the curb for 30 minutes of weak wi-fi.
Bring all the cash you'll need. There are no ATMs and no money changers, but you might be able to change dollars or euros in a pinch at a restaurant or hotel. Villa Etelvina and Hotel El Molino accept credit cards.