You can skip some optional activities during the tour and plan something on your own. So, when they are closed they will be replaced with some other attraction.
On fewer occasions, Tour Guide has to skip an attraction or few during the tour depending on weather, traffic, group interest or some other reason. So, it may be different from what is mentioned on the tour page. The order of activities held during the tour is planned by the tour guide.
The order of itinerary may change without any notice depending on weather situations or for some other unforeseen circumstances.