The phrase "lagoon side" means an area or location that is next to or close to a lagoon, which is a shallow body of water separated from the sea by a sandbar, reef, or barrier island. Full definition
Lagoon Side Cottage is a comfortable self - catering holiday home in Sedgefield, within walking distance to town, the lagoon, and the park. (travelground.com)
Tours typically begin lagoon side and head for the exciting blue waters of the reefs and cayes. (areibelize.com)