Latvian Multihull Yacht's Association

Supports building and racing of catamarans and other multihulled boats. Includes short history of organization and calendar of events.
http://www.ldja.lv/en/

Latvian Scuba Divers Association

Amateur group offers dive tourism, underwater photography and organization of competitions. Includes list of services and expeditions.
http://www.diver.lv/en/