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)
Citizens of 93 countries receive a 60-days stamp each time they enter Thailand. After that, you can extend your stay in Thailand for another 30 days (1900 THB at each immigration). If you want to stay longer, you can repeat this procedure if you leave Thailand for at least 24 hours.