if we can be a tourist in Hong Kong and Macau or if we need a Business Visa

A few of our employees at our company will be traveling to Hong Kong and Macau for an executive retreat in October. We will be in the country from October 23, 2013 to October 30, 2013. I need to know if we can be a tourist in Hong Kong and Macau or if we need a Business Visa to meet with vendors while we visit. Please advise.

If we need to obtain a visa, please send any information that will help in the process.