I never, ever peeked at my Christmas presents as a child. And not just because I was a good kid. I mean, I was a good kid, but that's not the point. I just never wanted to know ahead of time. I think anticipating the presents is just as much fun as opening them.
I have heard some funny stories about kids who got into their presents ahead of time though. For instance, one of my brother's friends in high school told the story of how she and her brother got into their presents, which were already wrapped. They carefully unwrapped each gift and looked and then started wrapping them back up. But apparently at some point during the "wrapping them back up" part they ran out of tape. At which point they moved on (thinking they were still being so sneaky) to using elmer's glue. Neon colored elmer's glue. Yeah, pretty sure that didn't fool anyone.
So what about you? Did you peek?