Ha!........ (My first thought) Check and see what liability insurance will cost to operate any type of business where people fall down as a sport. (second thought) What makes you think anyone wants a skating rink (just because you do)? Check with your local zoning board..they'll get back to you in 5 years. (third thought) I thnk there are new regs in place for "concussions". Try to site your skating rink within sledding distance of a hospital.
People don't actively "participate" in physical activity anymore. Everything is done on Wii, including sexual intercourse.