I have 1 month left on my tourist visa...and I don't want to leave, obviously.

I am planning on going to Malaysia for a week can I re-enter the kingdom on a second single entry tourist visa?

What is the best option for me?

With a single. entry tourist visa you should have received 60 days permission to stay on entry. You can extend it for a further 30 days at immigration without leaving Thailand, cost 1900 baht. You should be able to obtain another single or double entry visa if you leave Thailand and visit an Embassy or consulate. I would use either the Consulate in Savannakhet Laos or the Embassy in Vientiane Laos

Thank you I get my 30 days extension on Monday. I just worry the immigration here won't let me back in having two single entry or a double entry visa back to back..

With a single. entry tourist visa you should have received 60 days permission to stay on entry. You can extend it for a further 30 days at immigration without leaving Thailand, cost 1900 baht. You should be able to obtain another single or double entry visa if you leave Thailand and visit an Embassy or consulate. I would use either the Consulate in Savannakhet Laos or the Embassy in Vientiane Laos

There is no restriction on tourist visas or entries from them. Only visa exempt entries are restricted.

Thankyou, you have put my mind at rest

There is no restriction on tourist visas or entries from them. Only visa exempt entries are restricted.