Paramaribo is where almost every Surinamese trip is arranged, whether or not it is where the trip happens. The operators below are all based in the city and sell the same broad menu — a day out to Brownsberg or the plantations, a night on the Galibi turtle beach, a week up the Suriname River — because the interior has no booking infrastructure of its own. You go through somebody in town.
Most of them answer WhatsApp faster than email, which is the normal way to do business here rather than a concession to tourists.