Rule #1: Stay in your own lane.
Rule #2: See Rule #1.
Rule #3: See Rule #1.
Unfortunately, not everyone using that road is aware of these rules, so not only do you have to watch out for yourself, you also have to watch out for errant cars, transport trucks, and unfortunately bikes. Friend of mine got passed on the RIGHT by a Harley going in the opposite direction; the rider's eyes were wide with panic. That could have easily been a bike-to-bike head-on.
The other thing is, make sure you know how to stop or slow down in a hurry. It's not uncommon to see a 100 foot long skid mark leading straight off an embankment ... because someone jumped on the rear brake in panic and locked it up without properly using the front brake. If you go over the edge, it is a long way down.
The Gap was great in years past before it got so publicized. Now, you have to pick and choose the times you ride more carefully to avoid all the traffic.
Police enforcement in the last few years has not helped. It kept the fast, smooth, safe riders away, and allowed the touring bikes and cruisers to invade ("doesn't affect us, we're not going fast, and now all those squids aren't there any more"), but unfortunately, a lot of those folks have no idea what they are in for.
Have fun, take it easy, be safe!