How can I extend my tourist visa in Thailand after the initial 60 days?

The user is seeking advice on extending their 60-day tourist visa after the initial period is nearly over. They reflect on previous experiences of crossing at the Mae Sai border for a stamp but need current information regarding its status and alternatives like Chiang Mai immigration. Comments from the community suggest that the local immigration office can provide a 30-day extension, noting that all offices are closed for the Songkran festival and will reopen on April 18. Additionally, it is indicated that there are no land borders open in North Thailand.