Consider renting a car to get around easily in Signal Hill. Most places are within a 15-20 minute drive. Public transportation is available, but it's not as convenient as renting a car. Taxi rides can be expensive, so it's a better idea to rely on ride-sharing services like Uber or Lyft, which will cost approximately $10-$20 per ride.
If you have more time, add a full day at the Disneyland Park (35-minute drive from Signal Hill), take a tour of the Queen Mary, a retired ocean liner that is now a floating hotel and a museum. Alternatively, spend an afternoon shopping and dine at the The Pike Outlets. For a short trip, you can skip some attractions or combine attractions from different days that interest you the most.