I have a 30 day exemption visa that is about to expire and have already used both my border crossings by land, my question is which is a better and cheaper option, take a bus from bangkok to phnom penh and apply for a 60 day tourist visa, or fly out of the country then fly back in, if i do the second option how long do i need to be out of the country? Can i just get stamped out of Thailand and come right back in?