Here is
more info, although it is about WA national parks and forests:
Here's what we've found out:
National Parks will close. Most official entrances have gates, and those gates will be closed and you will not be able to enter them. National Parks visitors centers will be closed.
The Mount St. Helens National Volcanic Monument Visitor Centers will be closed.
Forest Service Ranger Stations will be closed. You will not be able to stop at a ranger station to buy a Northwest Forest Pass, get road conditions or use the restroom. Most Forest Service personnel are likley to be considered "non-essential staff." Some forest service law enforcement officers will still be working.
Hang your Northwest Forest Pass. We think it's unlikely that Forest Service law enforcement personnel will be out writing tickets, but if you've got one, hang it.
Land management agency websites will not be updated. You will also not get through to rangers on the phone. It being spring and one of the most essential seasons all year to check conditions before heading out, we strongly encourage you to try and find out about road and trail conditions other ways,
I am seeing lots of undocumented items (which may or may not be strictly rumor) including threatened fines for people caught hiking (assuming you meet one of the rare law enforcement rangers who isn't furloughed). I have seen a news article (but can't find it now) that state and federal highways that transit a national park, unless they have entrance stations, will not be closed. If parking lots are gated, they'll be closed.
On second thought, I'd call the folks at Pt. Reyes today or no later than tomorrow morning. Hopefully one of your group can get a few minutes' break to get to a phone! By tomorrow afternoon their phones will be ringing off the hook!
I'm quite sure they won't give you a refund, though. Not an act of God, but certainly beyond their control!
EDIT, later--found
this article specifically addresing Pt. Reyes. Doesn't look good.