Two Days in Los Angeles?

Hi all, This is so helpful! I will be in LA for the first time with my family the end of January. We have one full free day and was thinking of doing the Warner Bros Studio tour and then head over to Griffith Observatory for sunset. Is there anywhere nearby someone could recommend a nice dinner or do you suggest heading back to downtown LA (we will be at Staples Center) and eating someplace there? Would you recommend Uber as the best mode of transport for this plan? Many thanks!