I thought about what I should do to bring my inner child into my daily life, but to be honest, that is me every day.
I sing in the car to the point of sounding ridiculous and all I can do is laugh at myself. I avoid lines on the pavement when I have a long walk to the car or transit; just for the fun of it. I walk over puddles, try to kick stones as far along my path as possible, perform a victory dance with every single victory (big or small). These are just a few things I do normally. Do people look at me weird? Probably. Do I care? Nah.
I like to think we are young as long as we believe we are. I might not be a kid anymore, but I'm a kid at heart.