Walk into the Old Town
The Arco da Vila makes a natural starting point for the historic centre. Walk towards Largo da Sé and take time among the streets inside the walls. Choose a few places to understand rather than turning the morning into a race between every church and doorway mentioned in a guide.
The cathedral and Municipal Museum offer different ways into the city's history. If interiors interest you, allow one of them a proper visit before adding another. Keep the walking route manageable for the whole group; the smoothest-looking route on a map may include paving or steps that change the experience.
Pause around the marina
The Manuel Bívar Gardens and marina area provide a useful contrast to the enclosed Old Town streets. This is a good place to pause, look towards the Ria Formosa and decide how much of the afternoon to commit. A meal and a short stroll may be all the extra structure a city day needs.
Use the waterfront as a meeting point if your group separates for museums, shopping or a longer walk. Decide where to meet in specific terms rather than simply saying by the water. If you plan a boat outing, identify its actual departure point instead of assuming every vessel leaves beside the marina.
Add Carmo or another cultural stop
The Igreja do Carmo and its Chapel of Bones are a separate heritage visit beyond the walled centre. Consider them if unusual religious interiors interest you, with the subject matter in mind when travelling with children. Do not add the stop merely to tick off another attraction if the group would prefer time outside.
An accessible entrance to one part of a site does not establish access to every room. VisitPortugal's city route notes steps and narrower sections at some heritage venues. If access is important, ask about the particular spaces you want to see and choose the day's route around those answers.
Give the Ria Formosa a separate block of time
A lagoon outing adds nature and a different view of the city. Compare a short guided cruise with an island landing: they use time differently, and the one with more stops is not automatically better. Look at how long you actually spend ashore and what the return arrangements allow.
If beach time is the priority, make that the main afternoon rather than squeezing it after a full museum schedule. Praia de Faro has a road connection, while other islands require boats. Those access differences are useful when choosing an outing for a family or a group with limited time.