Jamieson, Fausset and Brown on Psalms 16:4

4. He expresses his abhorrence of those who seek other sources of happiness or objects of worship, and, by characterizing their rites by drink offerings of blood, clearly denotes idolaters. The word for "sorrows" is by some rendered "idols"; but, though a similar word to that for idols, it is not the same. In selecting such a term, there may be an allusion, by the author, to the sorrows produced by idolatrous practices.