Here are some options depending on the language and context:
English:
* Good morning is the most common greeting and will be understood by almost everyone.
Creole:
* Morning! is a common and informal greeting.
* Mawnin'! is a more casual pronunciation of the same.
* Good morning, how you doing? is a polite and common greeting.
Other languages:
* If you know someone's specific language (e.g., Hindi, Chinese, Amerindian), you can use the appropriate greeting in that language.
Important note: While many people in Guyana speak Creole, it's essential to be respectful of other languages and cultural backgrounds. Using "Good morning" is generally a safe bet for most situations.