Answer:
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I go inside boots and outside shoes.
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?
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.