Almost everyone visiting Portugal stays within thirty kilometres of the Atlantic. The interior is emptier, cheaper and where the country's oldest places are.
Thailand receives forty million visitors a year concentrated in about six places. The provinces between them are cheap, welcoming and almost empty of foreigners.
Rome punishes the wrong shoes and turns you away from its best buildings for the wrong clothes, and both are easy to get right.
Barcelona's famous sights take two days. What makes a longer stay worthwhile is the parts of the city that are not on the Gaudí route at all.
Tokyo defeats the checklist approach. Choosing one district and treating it as a temporary home reveals more than crossing the city ten times.
Ninety percent of visitors to France see Paris, Provence and the Riviera. The regions between them are emptier, cheaper and frequently better.