You can visit the Jesuit church for free at any time, but if you want to see the museum next door and join the bargain church tour, the museum tour is worth a try. It is a small fee of $20 (about 1.15 dollars), but only at 10 am and 5 pm there will be English travel (quite fast, English guidance is not very good). At other times there is a Spanish tour, or you can stroll around free places, but see galleries and libraries, you need to pay for it and need to take part in a tour. The gallery is nothing special, the library is modern, all books hang in glass graves in low temperatures, and the 'thrones room' where students face exams is the highlight after the church.