Answer:
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
What kind of tree can you carry in your hand?
I am heavy forward, but backward I'm not. What am I?
The more you take the more you leave behind. What am I?
I'm very tempting, so it's said. I have a shiny coat of red and my flesh is white beneath. What am I?
What never gets any wetter no matter how hard it rains?