I would say hands up screaming and yelling like a maniac. Especially on kiddy coasters for credits, hehe. lol. No i go crazy on rides, when im with my friends i go "Wahoooooooooooooooooooooooooooooooooooooooooo" and stuff like that, but when im on my own i just scream a little less enthusiastically. But still like a maniac. One of the reasons i like rides so much is that they are the only way you can scream at the top of your voice, without being stared at or removed from the place!
The only actual rides im quiet on is tower rides as they are the only rides that actually manage to make me a little nervous. If im going high in a coaster car, thats fine with me, but on a drop tower or shot tower, it changes for some reason. But on them i still often sit with arms and legs out (The proper riding position for tower rides if you didnt know) but im just less vocal. [:(]