A beach, a mountain and Gaudí, all reachable on foot from a single apartment.
This is a shape, not a schedule. Each day has two anchors and a lot of slack, because 3-day itineraries that book four things a day fall apart the first time lunch runs long. Move things around freely — the neighbourhoods are grouped so that walking between stops actually works.
Beach mornings and architecture afternoons keep a mixed group happy without anyone compromising. Spanish dinner hours mean plans naturally split and re-form — worth having the day's shape somewhere everyone can see.