Just got back from Riga guys - one word of advice, don't go to a strip club or massage parlour on your own. A friend of mine was drunk and went to one at 5am, he decided he didn't want any of the services there but before he left 3 guys approached (who worked there) him and demanded he pay 600 lats. He told them he didn't do anything and wanted to leave but they took him to a room and beat the shit out of him and stole his wallet, phone and camera.
Be careful guys.