Buses stop in the center of town.
If you plan to cross the border to Brazil make sure you get your passport stamped at the border, before entering the town.
To Brazil: Planalto has 2 buses every day to Porto Alegre (8hrs) leaving at 12:15 and 23:00. There is also a bus to Florianopolis on Sunday at 13:30. Planalto bus station is on the corner of Venezuela and Chile.