Poipet
is a Cambodian town on the Thai/Cambodian border.
The scenario of the Poipet border is a bustling market
where the Thais and the Cambodians of the two sides
trade with one another. From Poipet, you can either
get to Siemreap or to Phnompenh.
There
is a strip of casinos and hotels between the Thai
and Cambodian passport control counters, enabling
Thais to gamble in Cambodia without needing to go
through Cambodian immigration.
The Poipet border is open from
07:30 a.m. to 17:00 p.m., and foreign tourists can
obtain the visa here. A slight warning is that you
might be asked for some sorts of International Vaccination
Certificate by the local immigration officials.
It is only their attempt to make some extra money
as there is no such requirement. Some travelers
had reported that the fine imposed ranges from USD5-50.
This is not legitimate, of course. If you insisted
not to pay, generally the officials do not make
any hassle further. In case you are quite afraid,
pass the immigration with the other tourists so
that you won't be alone, or if you want to compromise,
some small dollar notes should be more than adequate,
though not recommended.
(source:cambodia-travel.com)