Enjoy a walking tour of Downtown Los Angeles. It's a part of this city (one of the only) best explored by foot.
Very interesting & educational walking tours are offered by the LA Conservancy. I believe they are $8. Red Line tours is another reputable company.
There are also Self-Guided tours. One, called "Angels Walk", offers a guidebook at any of the DTLA tourist kiosks throughout the city. Once you have your book, you'll walk from place to place and come upon an Angel's Walk kiosk that will tell you all about the area you're standing in or nearby attractions. You'll notice these all over downtown. They're a fun way to get more out of your visit.
Finally, if you type "Downtown Los Angeles Walking Tour" into google, you'll get USC's Architecture school's walking guide. It's more heavy into the architecture, obviously, but it's also good.
Recently a company began offering a tour where you get a headset and, using GPS, it figures out where you are and tells you about the area. The unique thing is that it tells you about it 100 years ago! (yep, DTLA was THE place to be back then)
Walking is an Eco-friendly way to see the town, but go in a group! Remember the rule 'there's safety in numbers'!!