Google Maps is accurate: https://goo.gl/maps/4eYdjHrdgRL2. Apple Maps is as well, but make sure you use 182 N Kanan Dume Rd (note the N). The start of the driveway is on the east side of Kanan Dume about 0.2 miles south of the Mulholland - Kanan Dume intersection. There will be a sign with balloons indicating where to go. If coming from the north, be on the lookout for the location on the left -- it comes up quickly after the Mulholland - Kanan Dume intersection.
Valet is available, although we recommend getting Uber/Lyft if possible (only about a 10 minute drive from the Sheraton in Agoura Hills). The venue is on the mountainside and accessed by a steep driveway. Drive to the top of the driveway (it's pretty steep -- but don't be alarmed as it is short), and the valet service will take your car from there.
Please take the time of the ceremony (4:30pm) seriously and give yourselves plenty of time to get there, get seated, and such. The after party will go till 1am.
It's an outdoor summer wedding, and the temperature will probably (hopefully!) be in the high 70s and sunny. The dress code is, say, "dressy casual". It is not black tie but not casual, somewhere in the middle. For the after party, there is an outdoor pool and jacuzzi, so bring your swimsuit!