I always like to visit Roman antiquities and this was one of the poorest developed. At €3 per person it is inexpensive, but you have to pay cash. The leaflet shows a recommeded route, but all the places shown are not available and some signs have fallen off or are discoloured. The signs are in Portuguese and English, but there was no guidebook to purchase.
Some of the walking route is on grass and other parts on stoney ground. It would be difficult for those with wheelchairs or pushchairs.
The museum is limited with only a partial story of the site and some exhibits on loan elsewhere.
You could allow between 30 minutes and an hour to visit the whole site. The toilets were good. There is no shop and nothing to purchase as a momento of the visit.
I have been impressed by much of Vilamoura, but not Cerro da Villa.