I would really not recommend that. Also, as a general rule of thumb, Singapore in general and its legal system in particular is nothing like Canada.
I quote from "Presumption of possession and knowledge of controlled drugs" in the
Misuse of Drugs Act, Part III,
18.
—(1) Any person who is proved to have had in his possession or custody or under his control —
(a)
anything containing a controlled drug;
(b)
the keys of anything containing a controlled drug;
(c)
the keys of any place or premises or any part thereof in which a controlled drug is found; or
shall, until the contrary is proved, be presumed to have had that drug in his possession.
(2) Any person who is proved or presumed to have had a controlled drug in his possession shall, until the contrary is proved, be presumed to have known the nature of that drug.
(3) The presumptions provided for in this section shall not be rebutted by proof that the accused never had physical possession of the controlled drug.
Basically, if drugs are found in your hotel room, you are presumed guilty of possession
and assumed to know exactly how much there and what it is
even if there is no evidence whatsoever (fingerprints etc) to link you to those drugs. Also, if there's more than 3 grams, you're not just in possession but trafficking (sec. 17(g)); and if there's more than 30 grams, you're virtually guaranteed to be sentenced to hang by the neck until dead. And if you tell the hotel you've found some drugs,
they now have to report the drugs (and you) immediately to the police, or face criminal liability "to permit or suffer such place or premises or any part thereof to be opened, kept or used for ... unlawful trafficking in ... any controlled drug" (sec. 11(b)). I'm not sure what a Singaporean lawyer would think if you told him about possessing some drugs, but I doubt it makes sense for either party to get involved.