Sorry to hear about that. Thieves are everywhere, and regardless of what you hear it can happen everywhere. People will tell you that Cliff Drive isn't a safe place, well one disc golfer left his trucking running the entire round we played out there, and nothing happened.
One year with over or close to 100 people at the Lion's Den a person had their window smashed, and unsure what was taken...so even with that traffic in the park, you just never know.
The best thing is to leave all the inside of your car looking like it's brand new, and nothing in it, if they see something they think that they want, or want to look at, a thief will go after it instantly.
This is why I hate driving my truck, because it has enough crap in it to run an army for a few days.....that and the tranny is about shot. Hoping it will make it through the weekend though!