I forgot... Oswald West (Smugglers Cove) was closed in 2008 due to falling trees. Not a good idea. I still go out to surf out there, but completely spaced on the "official" closure. Darn.
How about Fort Stevens (link: http://www.oregonstateparks.org/park_179.php)?
I've trailer camped there, but don't know if you can hammock camp there or not. Hmmm.....(pondering)
Unfortunately, I won't be able to make this weekend. Darn. Have fun and happy hangin'!