Decided to ask CA State Parks about regs on Hammock Camping, thought I'd post the reply:
From: Garlock, John [mailto:email@example.com]
Sent: Wednesday, May 30, 2012 10:17
To: Zinnel, Mark H CIV NMC CONUS West Div, N42W1DS
Subject: RE: Camping With Hammocks
Thank you for your email.
Ropes, lines, swings or hammocks may not be fastened to any plant, fence or park structure. Attach lines to your own property only.
Thank you for your interest in California State Parks.
California State Parks
From: Zinnel, Mark H CIV NMC CONUS West Div, N42W1DS [mailto:firstname.lastname@example.org]
Sent: Tuesday, May 29, 2012 3:19 PM
To: Garlock, John
Subject: Camping With Hammocks
Tried reading through all the regulations, notices and brochures but could find no reference to regulating the use of hammocks. Can you please provide any information regarding that topic?