Around the track:
Monterey PD and CHP turn into SS Nazi Guards whenever there's a WSBK event or MotoGP. Their only goal is to impound, tax, arrest and/or cite as many riders as possible.
Make sure your documents are in order. Insurance, registration, etc.
Do not have anything modified on your bike you could be cited for.
Do not attempt to exceed the speed limit within 20 miles of Laguna.
Do not ride with anyone you don't personally know. Even then, you might want to space out your distances from other riders, as they will pull over groups. You'll then have to wait for them to check every single VIN.
Ride safe and don't get caught.
Oh yeah, traffic is nightmarish getting in or out. GPS will probably take you to the main entrance. The back entrance(s) are typically less traffic-ey and are usually motorbike-only. Do your research prior to arriving so you don't get caught up in a snarl.
At the track:
It can be cold and foggy in the AM, despite it being sunny and warm 5 miles away. Prepare accordingly.
Bring sunscreen.
Spend the morning walking the track during the warm ups so you can figure out where you want to park your butt during the main races (Corkscrew is the best, just make sure you show up early to grab a good spot).
Bring lots of food & water.
Blanket to sit on wouldn't be a bad idea if you have the space.
Ear Plugs. Don't forget the ear plugs.
Other great places to watch: T1 (the crest on the front straight); Rahal straight just before the corkscrew (nothing like seeing WSBKs howl at redline going uphill with the front tire dancing off the ground, then braking hard for T7); and you can also get a nice, unobstructed view of riders braking for T11 from within the paddock itself. If you don't have a paddock pass, get one!