If you are a keen walker, the PR1 includes Belver, Praia do Alamal and Ortiga and forms a loop. It is 16km in length for the whole loop, and quite challenging in spots, but our favourite way to do it is to catch the train from Belver (there's not many, so you need to time it right!), get off at the Barragem and walk back along the river. This is around half of the loop, and of course there are a few bars en-route!
More details available via the link here.