Consider renting a car if you're traveling from outside the city. If you're already in Bell, you can use public transportation or Uber/Lyft to get around. Expect to spend around $30-40 on transportation.
If you have more time, consider visiting the Bell Community Center, which offers various classes and programs for families. If you have less time, skip Hollydale Regional Park and head straight to Bell Automotive Museum.
The nearest airport to Bell is Long Beach Airport (LGB), which is located 16 miles away from the city center. Alternatively, you can fly into Los Angeles International Airport (LAX), which is located 27 miles away from Bell.