If you plan to drive, car rental rates start at $30 per day, but keep in mind that traffic can be very heavy in LA. The city does have partially cheap transit options, such as the Metro Bus and Rail System which buses price start at $1.75 and should be taken into consideration when planning travel time. Taxis and ride-sharing services are widely available, but they can be costly depending on how far you're traveling.
If you have more time, consider taking a day trip to Santa Monica beach, just 45 minutes from Arcadia. For a shorter vacation, you might want to cut out a few attractions, depending on your interests. For example, if you're not keen on hiking, consider skipping the Baldwin Hills Scenic Overlook and opting for an extra day at the Huntington Library or Mt. Wilson Observatory.
The nearest airport to Arcadia is Los Angeles International Airport (LAX), located about 30 miles west of the city center. LAX is the fifth busiest airport in the world, so be prepared for long lines and waiting periods. Alternatively, the Burbank Airport (BUR) is a smaller option located 20 miles northwest of Arcadia.