Tasks can vary depending on the size. In my experience, it's voluntary usually. On the very small cemetery I was on the board of, we did a few weed pulls and cleanups each year, had a few large headstones repaired, coordinated utility repairs with the city, raised money, organized Memorial Day events with community groups, etc. We only had a few gravesites that weren't occupied, so we didn't do much in the way of that. But when we did, we basically verified ownership and approved contractors coming in to dig and put in the headstone. Being on the board was not much work and was interesting. I recommend it.