I've written extensively about Laarwijk, but before you reach Laarwijk you'll first have to travel to Domburg. That is, if that's where you pick up a boat.
Domburg is a sub division of the district Wanica in Suriname, which borders the district Commewijne (where the plantation Laarwijk is located), with the Suriname river in between. Because of the harbor in Domburg, this location has attracted many visitors. From locals (including people from plantation Laarwijk) to tourists from the city and even foreigners.
Especially during the weekends Domburg gets a lot of traffick, because of the market not far from the pier and the many food stands. People usually go on their days off - mostly Sundays - to enjoy the fresh windy air, the food and beverages and to watch some (motorized) water sports as attraction.
I can remember, most of the time that I've been to Domburg to cross the river, I've encountered sailing boats - with flags from mostly European countries - and "locals" (who can afford them) with speed boats and water scooters. Because we were there on a Saturday in December, it was fairly quiet.
And if you dare to step into one of those motorized canoes - if you don't have your own boat - to travel to Laarwijk, you'll get a glimpse of some high-end real estate. Possessing a piece of land or home at the river side is quite costly. A cousin whose dream it was/is to own a home by the river, has already looked into it.