Kalypso Media announces the Surf's Up expansion is now available for Tropico 5, the strategy/sim sequel for Windows, OS X, and Linux/SteamOS. Though the title implies this is about watersports, this actually has a touch of the Hitchhiker's Guide to the Galaxy (apparently today's theme), as it involves intelligent dolphins and a threat from aliens (the description makes it clear that this is not coincidence). The Windows edition of the DLC is now available through the Kalypso Launcher and all three editions should be available on Steam any time now. Here's word on the pack:

El Presidente has visited the void of time and space and confirmed his long-held suspicion: he is in fact the most important person in the entire universe. However, the enlightenment it granted gave him an ominous message: the planet earth is under threat from alien incursion – and they want to build an intergalactic motorway straight across Tropico! Enlist the help of the wise dolphins of the Pacific Ocean and save your banana republic in the ‘Surf’s Up!’ DLC for Tropico 5. Out today to download for PC, Mac & SteamOS via Steam, the brand new content adds a zany intergalactic adventure to the game - along with a new building, avatar accessory, sandbox map and music track. Rally the favour of the dolphins by building the Dolphinarium, look like a real professional with the marine biologist outfit and conquer the new ‘Qualichi’ island in sandbox mode. Help protect the island from annoying space tolls and you might just find the answer to the question of life, the universe and everything.