I received this hydrogen rocket for my birthday. We have been having a lot of fun with the launches. A park employee came to tell me rockets weren't allowed, but I pointed out (honestly) that the rocket only used water as fuel and we were allowed to launch. Given that we were the only ones in the park (as large as a football field) I don't think we were bothering anyone.

Check out that sky! Did I mention I got a circular polarizing filter?