First of all, when it comes to the expense of a trip, it varies depending on what fees are included, what guests prepay for and such.
Speaking of which expense guests need to prepay, you should include admission fees of facilities and/or activities where you need to book and pay in advance, such as the Ghibli art museum and a ceramics art class. Basically guides include them in expenses you would like to have pre-settled.
However, this is also determined during preliminary consultation between guides and guests. Depending on circumstances, guests may pay admission fees and these kinds of expenses on the appointed day.