I put this under general tips as the river beach is not really a must, but a very nice place to cool down in summer. It has a bar, showers, toilets etc. Last year they obtained a Blue Flag, which indicates that the water is safe for swimming.
The beach is on the banks of the river Cadavais. There are signposts to the praia in the centre of the town.
Favorite thing: A river separating two countries, two cultures, two cities, but everything seeming so close, so linked, that I had this funny experience: there was a popular festivity in Alcoutim, but the sound of the music came from across the river. The same festivity? The same saint? Just a coincidence?
Check the weblink to download a walkable city tour in Alcoutim. It is a pdf-document in English of the Municipality of Alcoutim.
-> direct download
Here the complete list of guides on the webpage of the Camara Municipal.