Most of the destinations on this itinerary can easily be reached by car or ride-share. If you prefer public transportation, the Metro Gold Line has stops in Arcadia and Pasadena. Expect to spend around $5-10 per day on transportation costs. It is recommended to check traffic conditions before heading out as some areas can get congested.
If you have more time, consider taking a day trip to nearby San Gabriel Mountains National Monument for some great hiking options. If you have less time, you can condense the itinerary by combining Day 2 and Day 3 into one day. Also, be sure to pack sunscreen, comfortable shoes for walking, and a light jacket for cooling evenings.
The nearest major airport to Arcadia is the Hollywood Burbank Airport (BUR), which is approximately 20 miles away. Alternatively, Los Angeles International Airport (LAX) is about 30 miles away. Both airports offer a variety of transportation options to Arcadia.