The latest from Dziobak larp Studios (the CoW / Fairweather Manor / Demeter team): Skull & Crossbones, a 4-day pirate larp. This being a Dziobiak game, they'll have three (small) ships - in reality early C20th fishing boats and freighters - which will sail around the Baltic between Germany and Denmark in search of pirate treasure for 5 days. Yes, that means the players will actually have to sail the ships. Cost to the participants is ~800 euro, plus 150 euro if they want to hire costume.
The design document is here.