@Gamalier *******

don't bother getting an extension on a multiple entry tourist visa it is valid for 6 months just do a boarder run every 60 days and you will get another 60 days each time ,then if you want to stay longer you can do a boarder run a few days before the 6 months is up and you will get another 60 days taking it to 8 months ,then you can get an extension if required to 9 months.

I would look at the less touristy places and see the real Thailand.

@Barry *********

where are you living now.,I would look for an agent when you are here to get a retirement visa