BANKING in Free Town. About American express Traveler's Cheque?

Hi All,

I was going over the banking system in Sierra Leone. It talks about Islamic Banking system. I am not aware of what that means.
I need to know if anyone can put me wise on the following:

1. If I come to freetown with American Express Traveler's cheque, would the banks in free town accept these ?

Appreciate information on it.

Hardish