Does anybody know how much it is to get in Reagan's library ?

Im going tomorrow and I don't know what to wear and also does anybody know how much a person needs to bring in cash to have a wonderful time there. I want to have a good time when Im there with my boyfriend.I don't want to bored him. It's extra credit for my U.S history class. btw Im open to any other suggestions you guys may have for me on my visit to Reagan's Library.