I think that we'll see "Old Nick" on ice skates before we see a port of MS Access to any platform
The only thing that I've been able to dig up is
Mac ODBC. To use this, you will off course need to have a copy of Filemaker Pro. It does not work with Bento, and given the nature of Bento I doubt that it ever will.
Failing that if you know anyone who uses Windows you could ask them to try
1) Export the Access database to an Excel spreadsheet
or
2) If they don't have MS Office use
Open Office. Get them to use OO to export it into a spreadsheet and then open that on your Mac using Excel.
None of these are particularly simple or quick solutions but I can't think of anything else
Sandy