Burma has one boarder open. Kawthoung. You get a speedboat or long tail from Ranong. You are given 20 mins in Burma and back to Thailand. Needs to be arranged through an agent. The idea of flying I think is best for you.
Suggest getting the DTV visa. I got it a few weeks ago and it will carry me till 50yrs. Or I renew DTV for another 5 years as (at the moment) it has less requirements.