Who’s been to a presidential museum?

I have a draft post waiting for my attention, about the coming Obama museum, and before I return to it, I wanted to ask you all:  have you been to a presidential museum, and, if so, what are your impressions?  Is it a “straight” history museum, or does it present the president as heroic?  How much does it talk about that presidency specifically vs. the president’s life, or the general historical context?  Thanks in advance!