N.F.
Near LAX there are several parks w/picnic areas that allow you to either see planes landing or taking off. One area is right off Imperial Hwy (it runs parallel to the road) Another is across from In N Out on Sepulveda.(This one is fantastic because the planes land right over your head) and a third is across from Dockweiler beach with a small playground, picnic tables and plenty of grass to run around on (the planes are taking off right over your head & this one works well for kite flying as well) Our kids never get tired of these parks because of the thrill of the planes. LAX also has a small museum that is free and is right off of Imperial Hwy. It's called the Flight Path Learning Center Museum.
Hope that's some help!
N.