Really excellent summary there. I've bounced through Bangkok and Pattaya for many years en route to Japan, Australia etc. Usually for 5 days at a time. Just back from Pattaya for first time since covid and it was a great trip. Much the same price as before.
Don't discount picking up locals in Thai bars and nightclubs. I don't really understand why this works as I don't get any looks at home. I'm late 40s early 50s. Quite grey but in reasonable shape. I've literally had my pick of absolute stunners who took care of me for an entire trip for nothing! Maybe just keep them stocked with drinks. Call BS if you want but give it a go first. Especially in Bankok.
Downside of this is you become quite attached and tears in the lobby as you wait for taxi to airport. But my God some of the memories I'll take to the grave.
Agree completely with the advice to be as polite and smile as much as possible. Learn some of the customs and language and it will go a long way to making a memorable trip. I've loved every minute I've spent in Thailand. Wonderful people and country.