Pesos!
Hi! As a CDN traveller, I hate converting twice (to US then to Pesos). I now buy Pesos right from the bank before I travel. It's SO much easier to convert.... I also find that people are happier to recieve pesos and listen to my crappy Spanish. I guess it's a case of when in Rome.... I think everyone appreciates it when you try to blend in. As a CDN I HATE seeing US cash in my country...... CANADA has a currency...so does DR. Pesos are great.
hope that helps...
Andrea