Cities: Skylines Game Keys

Go to: http://store.steampowered.com/ and download STEAM client
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.
After successful code verification go to the "LIBRARY" tab and start downloading.

Cities: Skylines - Parklife Plus is a playful combo pack, making your city more alive with new amusement parks, nature reserves, custom parks, gardens and zoos, and adding a country radio station for good measure. With everything from roller coasters and campsites to flower beds, fountains and flamingos, Parklife adds new ways to play, with the introduction of a new park area tool and level-up features that increase your parks property values, along with five new maps and a ton of assets in play. Country Road Radio includes 16 original new songs in four sub-genres: Appalachian Folk, Bluegrass / Honky Tonk, Nashville Modern Country, and Unplugged Country. The radio host is pure Dixieland Delight, spinning six instrumental songs and 10 with original vocals. Cities: Skylines - Parklife is a playful new expansion, making your city more alive with new amusement parks, nature reserves, city parks and zoos, and giving new life to your empty land with custom parks and gardens. With everything from roller coasters and campsites to flower beds, fountains and flamingos, Parklife adds new ways to play, with the introduction of a new park area tool and level-up features that increase your parks property values, along with five new maps and a ton of assets in play. More leisurely features: PARKS AND RECREATION Use the new park area tool to create park districts wherever there is empty land, and new city services like Park Maintenance, which boosts happiness and effectiveness and helps level up parks. BRICK BY BRICK Customize your city with new buildings and assets, including a new sightseeing bus line, new service buildings, new unique buildings like amusement parks, nature reserves, city parks and zoos, and a regal new monument, the Castle of Lord Chirpwick. FREEWAY FREE FOR ALL For the first time in Cities: Skylines, you can place buildings next to paths in the park districts (not just next to roads). Props can be placed anywhere inside park areas. RECESSES BETWEEN BUILDINGS Transform those empty spaces between your buildings into vibrant parks and gardens. IT'S A WALK IN THE PARK Customize routes and set ticket prices for new walking and sightseeing tours, among other tourism enhancements. POLICIES, PLEASE Take on three new city policies and eight new park policies to deal with recreational hazards like Animal Ethics and Fireworks.