Hello I am coming next month to Thailand from Belgium. Last time was 2 years ago. I travel business, I am too old for economy. I will land at Suvarnabhumi. I plan to stay 50 days. My only document will be a valid Belgian passport. Can I still stay 60 days without visa. Where does I go to immigration at the airport. Does I need to register on-line somwhere, if yes please give the link. Does I need an hotel reservation. The first week visit my gf in Isaan. Can she invite me, Which document should she send to me. If I forgot something please advice. Thanks in advance for your help.

No problem at all.If they ask why u come and where u stay just say come visit ur gf in isaan and will stay with her.

Good luck,.. enjoy ur holiday.

Moved to appropriate forum.

 

You can enter visa exemot and will get 60 day stay (as of now, could change in future)..

 

Within 3 days if departure you need to fill out online arrival card

 

https://tdac.immigration.go.th/arrival-card/#/home

OP, if you are flying visa exempt the airline at departure may want to see. Your return flight. 

You need to fill in TDAC. Link posted above. 

You do that up to 3 days prior to entering Thailand. 

Your last visit was 2 years ago. 

You won't be asked anything.