I have to tell you differently (arrived end of January). Some restaurants/bars in or around Bangkok will ask for double vaccination (I’ve even seen one saying triple vaccinated no less than 3 weeks prior 😅). Ko Samui ferry asks for it, and some events will ask for it.
Never seen one hotel require it though, and there are plenty of options anyways.
Only thing, though, most places that will ask for vaccination proof will also offer option to test on the spot or negative ATK test to get in.
We went to Aspira Hana and it was OK. The feature that was nice was the room was quite big with a couch so you don’t live on your bed during quarantine…