If ur in your own country i suggest you apply for a double entry tourist visa.
Most western countries will give you that, In fact u can also aply for a double in Laos.
When u arrive u get 60 days, before that is up you go to immigration and ask for 30 day extension 1,900 baht.
so after 89 day u go to a border and then come back in and you get the 60 days again.
If u only get a single u can apply for a single entry tourist visa in most neighboring countries.
IF u wnat to leave while ur still have days left u can apply for a re-enrty permti for 1,000 baht and then u will have the days not used when u come back.
Richard
Zenfolio | Richard Reitman Photography