You will need a rental car to get around Arcadia and the surrounding areas. Prices vary, so it's best to compare prices before booking. There's also public transportation via Metro Rail which connects the LA area. Taxis and ride-sharing such as Uber or Lyft are also options. Travel times will vary depending on traffic.
If you have more time, visit the Los Angeles Zoo or the Griffith Observatory in LA. If you have less time, cut out a few activities to make the most out of your adventure. It's best to check opening and closes times of places to visit and plan around them to avoid disappointment.
The nearest airport is Bob Hope Airport (BUR) which is around 20 miles from Arcadia. Los Angeles International Airport (LAX) is about 28 miles away but has more international routes available.