You can visit this attraction and not be required to spend any money! You can choose to make a donation or buy something from the gift shop, but there is no entrance fee and the tours are free. We enjoyed the church decor, the fact it is still in use, but many of the parts are very old. This is a wonderful way to spend an afternoon. Mission San Xavier is not necessarily a good site to visit in rainy or very hot weather. You need to walk outside to move between the church and the various parts of the grounds.