What are my options for extending a 30-day visa in Thailand from Chiang Mai?

The user entered Thailand on a 30-day Visa on Arrival (VoA) and is looking for options to extend their stay for another 30 days in Chiang Mai. They are considering options such as visiting the Immigration Office in Promanada for a paid extension of 1,900 THB or doing a border run to Mai Sai to obtain a new 30-day visa exemption stamp. Community members have confirmed that both options are viable, and they have clarified details about the border run and charging fees at the Myanmar border, along with potential proof needed for visa extension.