I've had mostly positive reactions, like everyone's been saying, minus one incident. I was flying near the Hollywood sign, from one of the trails, and as I started heading for the sign, I flew over one of the horse ranches that are up in the hills there. From my vantage point up on a hill, I could see down into the horse ranch, and there was a bunch of them in their paddock and some people outside. Some guy then yelled up to me, asking me to please not fly over the ranch, as it will scare the horses. I can tell you now, I was plenty high enough that I was not scaring any of the horses, and I'm sure they are plenty used to aircraft noise as there's police and tour helicopters circling the Hollywood sign every five minutes.
Nevertheless I called back down saying no problem and flew it away from the ranch. 5 minutes later as I was getting ready to leave, a hiker walked by me on the trail and told me I should be careful flying in that area, cause the park rangers have started issuing tickets to other people flying quadcopters. So it was a bit of a discouraging day to say the least. I'd been wanting to get a good shot of the Hollywood sign, but I'm not sure if I'll risk going back. Maybe early in the morning at sunrise or something.