I've been to the Nixon Library. It seemed small but nicely done.
I've also been to the Reagan Library.... several times. It is a must see. They acrually have the presidential plane and helicopter on site, along with Ronald and Nancy's gravesites there. It is set on top of the hill, with 20 mile views in every direction. They have a great souvenir store, as well as a restaurant with great food and even serve wine there. There are many interactive sets where you can broadcast a news set, or get on a stuffed, realistic source,and add motion to it while you make a film. They do a great job changing a few rooms every 2-3 months, so every time you go there, something new is there to peruse. One time they had all of Nancy's gowns displayed, another time they had American artifacts, another time that had Indian artifacts I like that every picture has a phone that you can listen to important speeches, and in his prime, his tongue was so sharp that he could cut down an adversary without them not even knowing it. That was the best president ever, and the pride for America is flowing once you are inside.