I just came through a few days ago with no visa. Staying for thirty days. Going through immigration they noticed on my previous tourist visa that I did a one day border run to Cambodia. They delayed me for 90 minutes to let me know that I cannot do that any more. So word of warning to any people coming in on tourist visa. Make sure you leave the country every 60 days, but do not do a border run any more. Leave for a few days instead, or longer.