We have a new site www.g-lish.org where you can read all articles from This is Ghana in a much more organised fashion. Read Two Travel Tips there.
Two travel tips for good measure:
1. You cannot use Mastercard in Ghana! Only Visa card is accepted (if this has changed, please let me know). Traveler’s cheques are difficult to change. It’s much easier and it's quite safe to bring cash and change at the multitude of forex booths scattered around the country and major cities and towns.
2. You can get a tourist visa on arrival at the airport in Accra, however you will need to show your return air ticket to immigration. I have, however, heard of people being refused entry onto (Delta) flights in the USA for not having a visa before traveling even though tourist visas are issued on arrival.