Just visited here for two weeks and would have loved a thread on places to go at night after eating (previous thread having been discontinued).
First of all this isn't Ibiza so don't expect a vast list!
My two cents:
1) El Tubo Bar - Great food, wide-ranging with spanish and american style. San Miguel for 1 euro and and great atmosphere for sitting and having a drink. Our go-to place really with free WiFi! Situated at the end of Riels beach closest the Harbour.
2) Octopus Bar - A bar looking over the Harbour owned by a Swiss woman is open till the wee hours and again a good atmosphere with many of the locals going. Also has a pool table!