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If you are a people person and enjoy a happy environment, you may want to get a bit more detailed with your preferences. I too am a people person and enjoy a happy environment but when working with other people quite often, they are not always happy, and so it will be your role to change around any negative atmosphere and continue the spectrum of happy.
I would consider an entertainment company, an event or party planning role, wedding planning even, a marketing company for a "happy" type product, or anywhere that offers your vision of happy surroundings.
Hope this helps!