You won't find many public restrooms in Belize, but hotels and restaurants usually have clean, modern facilities with American-style—indeed American-made—toilets. Hot-water showers in Belize often are the on-demand type, powered by butane gas.
Restrooms in Guatemala use Western-style toilets, although bathroom tissue generally shouldn't be flushed but discarded in a basket beside the toilet.
The Bathroom Diaries. The Bathroom Diaries is flush with unsanitized info on restrooms the world over—each one located, reviewed, and rated. Unfortunately, only one bathroom is listed in Belize. www.thebathroomdiaries.com.