Build estimates by city and travel day rather than one nationwide daily number. Expensive transfers and peak dates can shape the total more than meals do.
Separate fixed and flexible costs
Transport, key stays, and tickets are easier to protect early. Food, local rides, and optional experiences need a realistic buffer.
Spend where it changes the day
A better-located hotel, a simpler transfer, or one well-chosen guide can create more value than adding a long list of paid attractions.