That is nice! I probably would consider taking advantage of it if the school offered something my children wanted to take that I couldn't find through a homeschooling program. If nothing else it doesn't harm anything to try out what is offered.
In my state its up to the district. I wouldn't use it for sports because there are lots of other alternatives like ymca and parks and rec. I could see using for something like drama club. My dd loves drama and we exhaust all options we have in the community.