@Sari12
You already have optimized your listing to discourage this behavior.
You charge a $20/guest/day charge and you have a 3 day minimum. Even though you may not like love shack behavior, at least you are well rewarded for such activities.
Is it possible for you to embrace your special niche?
I love California. But in my mind there are 2 Californias. One California is highly energetic. Go to the City, spend a lot of money, see a lot of people, do a million things. Exhausting and expensive. The "other California" is like beautiful, suburban LaFayette. A wonderful setting to be lazy and enjoy the wonderful weather.