It really depends on sentence flow. With the usual SVO order, the subject becomes the focus.
If the context or dialogue goes like this: "Where are you staying for your vacation?" then the logical subject of the answer should come first, e.g. "I am staying ..."
However if the lead-in focuses more on the itinerary rather than the traveler, e.g.
"What is your plan? Can you describe your itinerary?" then it makes a lot of sense to start with "My itinerary involves..." or "My itinerary consists of..." or for a passive voice, "My itinerary is composed of..."
If the context or dialogue goes like this: "Where are you staying for your vacation?" then the logical subject of the answer should come first, e.g. "I am staying ..."
However if the lead-in focuses more on the itinerary rather than the traveler, e.g.
"What is your plan? Can you describe your itinerary?" then it makes a lot of sense to start with "My itinerary involves..." or "My itinerary consists of..." or for a passive voice, "My itinerary is composed of..."