A few years ago, a friend in China invited me to spend a significant amount of time with his family. I applied for a 10 year tourist visa, using his letter of invitation and one of his family's houses for where I would stay. The embassy gave me an S2 visa instead, which I used several times that year.
Now, I would like to take a vacation to China. I won't be seeing my friend. My S2 visa is still valid. Can I use it or do I need to apply for a new tourist visa?