It's barely dangerous at all on the side with less of a slope. I met a guy there like two weeks back that was skiing on a knee that recently had surgury. I guess it all depends on if you have ever done boxes before. There is a really easy flat one that you could chill on for saftey. Overall, it depends on the tricks you are trying, 270s on to the urban are the only thing i have hurt myself on cause of the wall that is next to it.
And hey, if it doesn't work out, its only 10 bucks an hour or 20 for a day, I think its worth the try!