Yum, we LOVE inn-n-out burger! Just enjoyed lunch there last month, the one closest to Nixon's Presidential Museum (and library). Not sure which one but it was de-lish!
And while i'm posting, here's a *plug* for visiting our presidential museums. They're called libraries, but are MUCH more of a museum than library for the general public / tourists -- the library is by special permission only.
Regardless of your political affiliation, all pres. museums are excellent and present an incredible, comprehensive historical overview of that period in time.
Of special note, Pres. Nixon's is a very short drive from DL. Our kids found it very interesting, especially the MANY visiual displays and videos from the vietnam era. They said it was a much better education than anything they learned in class.
Also, while not as close, Pres. Reagan's Library and Museum is NE of LA in Simi Valley, CA and also excellent.