What is the best way for a UK citizen to border bounce from Chiang Mai for a tourist visa extension?

I'm a UK citizen in Chiang Mai on last week of my first tourist visa.

So far: visa exempt -> education visa for a year -> this tourist visa -> 30 day extension -> now.

I plan to border bounce shortly and have completely forgot the best way to go about this or whether I will have any likely problems based on the above? I want another visa exempt, then an extension, and then I'm off back to the UK.

I can't remember name of the bus company/place for long journeys to/from ___? Will I need to stay over? Can I return same minute/hour/day?

Would appreciate if somebody could help!