Tachileik can be accessed from the Thai town of Mae Sai, which sits directly south on the other side of the small Mae Sai River.[1] There are two bridges that provide access between Mae Sai and Tachilek, one is actively used for border crossings and the other newer one was not yet being utilized as of January 2007. It may be possible for tourists to take a bicycle across the bridge, but logistically it would be difficult. It is a porous border and is actually not difficult to wade across the river. Burmese merchants used to be able to cross over and do business in Mae Sai for days at a time. The border is also a popular destination for Westerners (referred to locally as farang) who either reside in or are visiting Thailand and who need to get their passport visas renewed.
There is no charge for a 'visa run' going from Thailand to Burma on the Thai side, but there is a charge of US$10 or 500 Thai Baht on the Burmese side.