One row per park-local day, ascending by date, exactly as GET /v1/entity/{id}/history/daily returns for this entity on its own. A day with no data is ABSENT, and an entity with history but nothing in the requested days has an empty array rather than vanishing from entities[] — so the entity list keeps its shape from one page to the next.
One entity of a park in a park DAILY response: its identity, the first day it has any history, and its day rows. The park itself appears as an entry too when it has history of its own (match it by id against the envelope's id). An entity with no history at all is ABSENT from entities[].