You're the person who picks the place to go; it's your way or the highway, quite literally.

You throw your suggestions out there, but they are all rejected. You spend the rest of the night sulking.

You're the person who always says, "It doesn't matter to me. I'm open to anything. Choose whatever." You end up as the designated driver.

You're a details person - you suggest modes of transportation, calculate tips after dinner, etc.

You mediate any arguments that arise, soothe hurt feelings, and make sure everyone's having a good time.