If you could be a kid again, what's the first thing you'd do?

... Wish I didn't have to.

LOL

I'd ask my mom to make her delicious pot roast. After dinner, I'd go outside with my friends, catch fireflies and lay in the field looking at the stars.

I'd play all day long.

I'd pass. It took a lot of sweat and perseverance to get where I am now. There's no guarantee it would come out this well again. 

I'd tell my mom and grandparents how much I loved them.

I read the question as not going back in time and redoing a part of my childhood. I read it more as if I could be young again what would I want to do again......

Soooooooo I think if I was a kid I would want to play with "Littlest Pet Shop" All three of my daughters got into them and I always thought they would be so fun to play..... So they usually got the extra cages and houses and accessories and stuff! Lol!

I would do things alot differant

Round up some more kids for a game of American football.

Anything physical, because you don't realise how bendy you were until you grow stiff and fragile.

I don't want to relive it.

Let's see . . . Go to an amusement park, eat loads of junk food, then finish off the day watching movies at the Drive In theater.

While I can do ALL these things now, I pay dearly for them . . . Except the amusement park one . . . I just more tolerance for people back when I was a kid, so I wouldn't be as irritable.

I think People missed the part where you can be a kid again . . . without going back in time . . or at least that is how I took it. 

If it was to "Relive your Childhood" I might select some thing differently . . .

Enjoy the fact I had no responsibilities.

That would be about 60 years ago.  Hmm....I would jump 60 years forward ASAP.

to not get my age again

Stay home.

There are so many things, that as an adult I never realized were so important, so I would go fishing with my grandpa and bake bread with my grandma and learn all the things they were wanting to teach me that I didn't make time for.