We're driving down to Phuket soon and my dad will need to do a 'border hop' near that time. Is there a border checkpoint, where he can get his passport stamped, near Chumporn or somewhere enroute?

I was hoping to drive at night, but I guess they'll all be closed then, won't they?

Thanks for your help.

Yes they will be closed at night ...

Ranong is probably your best bet

Yeah, Ranong is the only place anywhere near.

Ranong, but your dad will have to do the longtail trip over to Myanmar and back.