1. Sunny Jim Sea Cave is located in La Jolla, California, and is known as the only sea cave in California that is accessible by land through a man-made tunnel. The cave was named after \"Sunny Jim,\" a cereal mascot whose face the opening of the cave is said to resemble.

The cave was discovered in the early 1900s and was soon after turned into a tourist attraction. Visitors can descend a narrow staircase that leads to a tunnel, which takes them to a platform overlooking the cave. From there, they can observe the stunning natural formations of the cave, including its towering 60-foot-high ceilings and beautiful rock formations.

2. The working hours for Sunny Jim Sea Cave can vary, so it is recommended to check their official website for the most up-to-date information. They do not provide a phone number for contact.

3. Admission to Sunny Jim Sea Cave is available for a fee. Tickets can be purchased at the Cave Store, which is located above the cave entrance. Transportation to the cave is usually self-arranged, as it is easily accessible by foot or by car. There is parking available nearby, but it can be limited during peak times, so it is recommended to arrive early.