1. US citizens are not entitled to purchase a Visa on Arrival. I assume that you received a stamp in your passport allowing you to stay in Thailand for 45 days Visa Exempt Entry. You do not have a visa. 2. You can extend your stay by a further 30 days at the Immigration office for a further 30 days. After that time, you must leave Thailand. 3. You can depart at a land border crossing to an adjoining country or fly to another country. In that country, you can apply for a tourist visa or you can return to Thailand by land or air and receive another Visa Exempt stamp which will be good for 45 days.

Your extension lapsed when you departed Thailand and is no longer valid. If you wish to return to Thailand your only option is to start again from scratch. Good luck.

@Stuart ********

I was assuming that he will be entering Thailand on his German passport.

Currently 45 days plus 30 days extension. The 45 days runs out next year and returns to 30 plus 30.

@Dieter ******

And you can extend at Immigration office for 30 more days for 1900 thb

Veery easy process to do yourself but will take a few hours.

Bike or car? Do you have a current licence from your country?

Try an Indian visa site. This site is for Thai visas.

if you want to stay long term in Thailand then you need a visa appropriate to your stay.

Your passport and money.