teya_suchira on IG she is a licensed Thai tour guide with over 24 years experience. She can plan any tour even for you. Contact her and she what kind of tour she can arrange for you
you apply for the NON OA from your home country Thai Embassy or any other outside of Thailand. If you are in Thailand you can enter on the 30 days (soon to be 45 days) if you are from the exempt countries and then while in Thailand convert to the NON O visa.
btw yes you need to show proof that you have taken at least two shots of the vaccination one plus the booster. I have had 4 shots so no problem. Only had to show it at the port of departure. On arrival they didn't ask for it. Entry requirements are almost as normal as pre Covid days. Out of immigration within minutes. I didn't even have to give my fingerprints 5555 though the one ahead of me did it.
I flew from BKK to Toronto last month and had a return ticket. At the Toronto airport I was questioned if I had a return ticket back to Canada or an onward flight ticket to another destination. I open my passport to my visa page and showed them my Thailand retiree visa valid till Feb 2023. They said ok and then proceeded to issue me my boarding pass. The same thing had happened in the Philippines when I visited about 2 months ago. At Manila airport I was asked the same question and I had to show them my visa page. Lucky for the guys who fly out numerous times and were never asked this question. But i happed twice for the two occasions I flew out since the pandemic.