I've been wanting to do a weekend trip that way . Got any good first hand info for the out of towner .
-beerjet-
I'm no local, only been there once, on a wednesday. I met up with Dozzr (from Hotboat) at around 1pm and went out for a couple hours. I saw only 2 other boats out....a bass boat & a tooner. Water was pretty good, seemed less choppy than Castaic in the afternoon. Much less chop than Piru. Parking & launch fees total $15. There's a shitload of camping spots (400+), though the place was pretty deserted.
One thing that kinda sucks is that it's a "no contact" lake....no skiing, boarding, swimming, etc. But for rompin' and doing high-speed passes it seemed pretty cool. We were there for about 4-5 hours and I never saw any l.e.o's. From what I understand N8DAWG lives close by, as does DOZZR, so those guys can tell you more.