Entering Thailand as a tourist for a period of 30 days without a visa is relatively easy for people from countries such as the United States, most of the European Union, Australia, and others. (Check the Thai Immigration website for the latest info)
Regardless of visa type, many visas can be extended within Thailand at a Thai immigration office for additional periods, typically up to 30 days.
Note: It’s important to note that visa requirements and regulations can change, so it’s advisable to consult the nearest Thai embassy or consulate or visit the official website of the Thai Ministry of Foreign Affairs for the most up-to-date information before planning your trip or stay in Chiang Mai.