Family travel planning is a negotiation between several sets of preferences and one budget. Published itineraries assume a couple with no constraints, so half the plan gets cut on arrival and the rest is paced for somebody else's holiday.
The Holiday Planner Context holds who is travelling, everyone's ages and what each of them actually likes doing, where you want to go and where you have ruled out, and the annual budget that decides the shape of the trip. It returns a day-by-day itinerary with pacing that suits the group, so the plan accounts for the youngest traveller and the adults on the same day.
The itinerary arrives already filtered by the things you would have struck out anyway. Next year's trip starts from a Context that already knows the family.