Well I'm well below the weight limit but still fat and they didn't ask to weigh me. Honestly if I were above I'm not sure I'd want to do it because it's there for a reason, but you can always call ahead and ask about it. If you are worried about being weighed around other people if they need to double check maybe you can weigh in early before they let everyone in or something.
It is totally worth it if you can do it. But when they say bring comfortable shoes they mean it. My feet actually got quite sore a few times on that ride, but really it was too fun to really pay attention to it.