You don't want excess AR$ in Chile. EVAR. Even prior to things being as desperate as they currently are (when it was about 3 to 1, and relatively stable for some time), I couldn't get rid of them. Maybe I didn't look hard enough, but if I did find someone to take them, it would have been at a huge discount. LAN won't take them for Duty Free Sales, and haven't for quite some time, even when their magazine used to say that they would (and this was a flight from EZE).

I suggest that you ask places if they accept US$ and at what rate (when you arrive at a restaurant, etc., if they don't have something posted), and have AR$ to pay the bill just in case they don't, or not at favo(u)rable rate.