Get a tailored packing list based on weather, activities, trip length and luggage type, with quantities, outfit combinations and the things people usually forget.
Build a group trip budget and split costs fairly, separating shared and individual expenses, with a who-owes-whom table and clear money rules for the group.
Plan a road trip split into daily legs with realistic driving hours, worthwhile stops, rest breaks, a rough cost estimate and a backup plan for delays.