Apply for an International Driving Licence at home. Officially it is valid in Thailand for 3 months. If you stay longer you'd better check for a Thai Driving Licence. Immigration....Medical Certificate and some small tests at the Department for Land and Transport (DLT).
Sorry, but I've never been there. But if there is an official border crossing, why not! Wherever you cross the border it all depends on the officer of the immigration.
The deputy director general emphasized the number of repeatable visa exempts will depend on individual immigration officers who have absolute discretion. (Khun Naruchai Ninnad, representing the ministry)