How should the woman pay for the books as the man suggests?

W: I wonder how I should pay for the books I just ordered?
M: You can pay by check．You can also use your credit card．In that case, you pay two dollars more．If I were you， I’d send them a check．

M: So， what do you want to do tomorrow?
W: Well，let’s look at the City Guide here．Ah，here is something interesting． Why don’t we first visit the art museum in the morning?
M: OK．good idea．And where do you want to eat lunch?