Hua Hin has beaches and mountains. Bangkok has great food. Chiang Mai has great food and mountains. Kanchanaburi has nice rivers and waterfalls. Isaan has dust then more dust then a few ruins.
Condos are great if quiet with good gym and pool. Even better if you have good shops and restaurants nearby.
Isaan is a dust bowl with very little to do.
About as exciting as moping a floor and I'm good at snooker. Just very boring waste of time activities. Chess and snooker must be the worst retirement activities ever.