TM7 form:

@Douglas ******

No Thai consulates in Siem Reap or Da Nang. You can visit those places for sure, but not get a new visa there.

One thing you could do is book an inexpensive flight in the region for before the end of the 60-day visa (that gives you POOT for your visa and for check-in) and then actually TAKE THE FLIGHT (now how original is that? :-D) Stay away a few days, give yourself a little holiday from Thailand and in the process get a new 60-day single-entry tourist visa (SETV). That covers you for the four months without having to deal with Immigration. Phnom Penh, Penang, Kuala Lumpur, Vientiane, Saigon are all wonderful destinations for a short break — and all have Thai embassies or consulates.

You need to book a FLIGHT out of the country within the 30-day visa exemption period or you will be denied boarding. It must be a flight because the airlines can confirm on their databases. A cheap Air Asia hop to Penang will do, for example, or it could be to Vientiane, since you want to go there anyway. In Thailand, you can get a 30-day extension to your exemption at any Immigration office for 1900 baht. Then you must leave and come back either with a proper visa or another exemption. But Immigration starts to make problems when you try to enter too often on exemptions. You onl< get two land entries per calendar year in any case.