Budget a theme park visit.
Theme park budgets break on the in-park spend, not the gate price. Tickets and food both multiply by party size, while parking and souvenirs are group costs, and inside the park food is typically priced well above high-street equivalents. Showing the ticket share of the day makes the point clearly: for a family it is often barely half the real cost.
Day total
Total = (ticket price + food per person) x party size + parking and travel + souvenir budget
Ticket share
Ticket share = ticket subtotal / day total x 100
Bringing water and snacks where permitted, which commonly cuts the food block by a third or more. Multi-day and off-peak tickets are the next largest lever.
If you are visiting on a peak day, add them explicitly — they scale per person and can rival the ticket price itself, so leaving them out understates a busy-day budget badly.