I use one nearby as a low-traffic bypass, quite frequently. Avoiding funerals, of course. I wave at the grounds crews, they wave back. Gates are open, visitors welcome, and I just pass through anyway.
Related topic: "back in the day" before public parks were common, cemeteries were the place that urban people went to enjoy the outdoors - because, they were the only open, green spaces around. I've read that funeral homes would have open houses, host festivals, all sorts of fun times (good for business, etc, too).
I've often thought that some cemeteries would make for really fun race courses... free publicity for the owners... but of course we have this social taboo to overcome.