Cash is King in SXM for sure but we hate carrying large sums of money when travelling and tend to use credit card more now than in earlier years. Keep in mind though you won’t get the best exchange rate from your bank and they probably will charge you an exchange fee as well if you use your Canadian credit card. We have a BMO card in US funds and a US funds bank account that automatically pays out our US credit card, we use Knightsbridge to purchase larger sums of US money whenever the CDN dollar spikes and deposit it in our US bank account. This minimizes bank fees, (Canadian banks are doing fine)😀