Most states, provinces, and countries don't have laws specifically regulating any minimum age required to get a hotel room. On the other hand, most hotels, for insurance purposes, require somebody who is legally responsible to sign for the room, in case of trouble.
You want to find a lodging establishment that doesn't really care about the age of its patrons. This implies seedy, or at the very least cheap.
Find something indeterminate. Recommendations:
* Motels in general
* Comfort Inn
* Small, fenced-off places that still seem somewhat reputable
Walk with confidence. "I do this all the time." (Don't SAY it, just think it.) Act as though nothing is strange. Dress respectably. Be polite. Even if it's against the rules, if you're nice and the clerk doesn't really care: you're In Like Flynn.
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LOL