Hi .. seems like the immigration website is not available for 90 days notifications .. so

I have to go there in person and report.

Anybody remember what documents and what copies I have to bring with me?

Thanks

I thought you just take your passport & fill in a form.

Depends whether you go to immigration drive-thru by the airport or to the Promenada office.  Prepare the form TM47 and have your home GPS coordinates.

here's what my local IO says on its website (http://www.samutprakanimmigration.go.th/):

 

You will find, that towards the end of the day it will be less crowded. If you have all your documents in order, you should be in and out within 5 minutes. You need to fill out the TM47 form and bring photocopies of the following pages in your passport. In addition, you may be asked to show proof of address. So, please prepare a photocopy of your house registration or rental contract.

• Front page showing name / surname / Passport No., etc.
• Current visa
• Last entry stamp of immigration
• Last extension of visa
• Photocopy of departure card TM.6

The OP is in Chiang Mai, not Samut Prakan.

Passport and completed TM47 for drive in, very simple.

Thanks ..

Just done my 90 day report on line.  No issues.

In Chiang Mai just the completed TM47 form, with the GPS coordinates of your residence and your passport.  Drive-thru at the office near the airport is very easy.  No copies needed.  Shame that online is offline again.

No copies of anything for drive thru..