folder fanatic, I've been to pretty much every cemetery in the L.A. area (no, I'm not morbid! I'm a cantor at my church!) and have seen lots of bicyclists. Perhaps the ones who got chased away were causing some sort of disturbance (driving directly through funeral processions). Most of the cemeteries here are pretty laid-back about people using them for recreational purposes, as long as they're respectful.