During your stay in Agoura Hills, you will need to have access to a car to move around the city. The city is small, so this should not be an issue. Expect to spend around $30-$50 per day on car rental costs.
If you have more time, add a visit to the Santa Monica Pier . If you have less time, shorten the wine tasting experience or choose either Paramount Ranch or Chesebro Canyon for a shorter itinerary.
The closest airport to Agoura Hills is the Burbank Bob Hope Airport (BUR), located about 30 miles away. Another option is the Los Angeles International Airport (LAX), located 35 miles away. Both options have shuttles, taxis, and car rentals available to take you to your destination.