Some people like to fold their arms or put their hands behind their backs to help them remember. Walk respectfully in a museum. Talk in quiet tones in order not to disturb other museum visitors. You may always of course ask questions of your teacher or tour guide. Just enjoy the museum and leave your camera at home during your field trip.
Museums have rules about using cameras inside.
For example at the Kimbell Museum there is no flash photography allowed in special exhibits. Leave your backpack or large purse at school during your museum tour. Bulky objects slung over your shoulder might bump a work of art and damage it.