There's a bike/walking trail that links Quail Hill to Bommer Canyon. You're not supposed to leave the trail, but it's possible. I wouldn't be surprised if security came to try to arrest you if you attempted to wander around on your own. For open houses I'm pretty sure you have to call the broker in advance. You can't just drive up to the gate and say you're looking. You used to be able to but I think some of the few people who actually live there didn't like lookie-loos (or people taking short-cuts) driving though on the weekend so they quickly put a stop to that.