Some of my thoughts:
If the State Parks close, the small towns that depend on park visitors will also suffer.
If the State Parks close, people will walk into the parks anyways, and leave their trash, which will attract bears, and cause many problems. Trash service will stop, so even in non-bear areas, the mess will be huge. The bathrooms will also be closed...so you can imagine what people will be doing.
If the State Parks close, with no rangers to patrol the parks, game poaching will increase.
If the State Parks close, the homeless will move in.
If the State Parks close, drug farms will move in. Not the happy hippy type, but the scary machine gun type.
If the State Parks close, the Rangers and Park Aids will loose their jobs.
p.s. For every $1 spent on state parks, $2.35 comes back to the state, so it doesn't even make $ sense to close the parks. The National Parks have actually have cut fees for a few weeks to incourage visits, so that people will spend more money in the small towns around the parks...why is CA doing the opposit?