Before the visit, become thoroughly familiar with the questions you have been assigned to explore. During conversation times such as during breaks, walking in the halls with a student, in meetings with the staff - be ready to ask questions which were not answered during observation sessions. Use these occasions to ask for greater clarification about how the school went about restructuring, including any difficulties encountered and how they were addressed. Look at things like the maintenance of the building and grounds, accessibility, menus in the cafeteria, hallway and classroom decor, the presence of parents, lighting, ventilation, noise levels, office placement, ambiance of the teachers room, etc. Ask first about taking pictures.
Cameras can be a distraction, and in some cases, it is against the law to take pictures of students.
Note-taking can also be a distraction to some students. While in the classroom, it is sometimes easier to observe and then jot down notes after the class has been dismissed. Remember you are a guest who has been invited to share in a very complex organizational dynamic. Select your most important questions to raise during the group interviews. Reserve any evaluative comments for the debriefing sessions which follow the site visit.