Getting to the Border
The Bac International international quay is about 2km south of central St Laurent, down Av Eboué. It's possible to walk, or you can take a taxi from town for €4. Be sure to stamp out at customs and immigration here. Note that you can now get Suriname Tourist Cards and visas from St Laurent's efficient Surinamese Consulate, as well as at the one in Cayenne. Bring a passport and yellow-fever certificate to get a tourist card or visa here.
At the Border
Private pirogues (dugout canoes; €3 per person, 10 minutes) are the easiest way to cross to Suriname, and leave the quay on demand all day, dropping passengers at the Albina ferry dock on the river's far side. Otherwise, the car ferry Bac La Gabrielle crosses the river four times per day in 30 minutes (€4/€35 passenger/car). Note that there are no ferry services on Wednesday afternoons or Sunday mornings.
Across the border in Suriname, shared taxis (SR$75, two hours), minibuses (SR$30 to SR$40, 2½ hours) and public buses (SR$8.50, three hours) to Paramaribo meet the boats in Albina.