There are many beach towns around the coast. We think Balboa has the most fun. It's good to start on Harbor Blvd and drive into Newport Beach. As driving west, you will see many bike rentals and kite shops.
In winter, driving to the Balboa Pier area, you need to turn right at the traffic light, and there is a parking lot. Then walk there and read the sign. It provides some information about the history of the area.
Next, when you leave the parking lot, turn right at the traffic light. Keep to the right at the Y, no matter how many roads you see like this shape. Park when you see a stop sign. Walk to your right along the coast above the rocks and watch the waves, which come in from three different directions.
When you continue your trip, watch for the sign. This will take you to the Balboa ferry(渡船). The cost is small and the ferry takes you to Balboa Island. You can drive around the island.