Redondo Beach is a walkable city and many of the main attractions are within walking distance. If you need to travel further, the Metro bus system is a great option. A day pass costs $7 and allows for unlimited rides. Taxis and rideshare services are also available.
If you have more time, consider renting a bike and exploring The Strand, a 22-mile bike path along the beach. If you have less time, skip the Redondo Beach Historic Library and head straight to Seaside Lagoon for some fun in the sun.