I want to travel to Xinmatai. Where can I exchange these three currencies?

First of all, in these three countries (all in Southeast Asia), RMB is hard currency! Most of the consumption is RMB!

You can bring US dollars and RMB, and just ask a tour guide to change some when necessary! It won't be too outrageous!

It better be dollars on the card!

When you arrive in Xinmatai, the tour guide will change money for you, but the exchange rate is definitely lower than that of the bank. You can change it appropriately. If you want to buy something, you can use a bank card with UnionPay logo to swipe your card and automatically switch. Cost-effective.

In short, people who have been to New Matai will not find it very interesting, especially Thailand. However, it's good to see more places in this world.