My time in Bawjiase, Ghana, was great. I learned that I don't really need many things I just take for granted back home... so I think it would be a good experience for everybody.
We mostly woke up very early in the morning, then went for a little walk to fetch water from a well, so we all could take our bucket showers (that was a really important point, because you're sweating the whole day). Then, after breakfast, you can't wait to walk up to the orphanage and play with the kids or help them in school. They appreciate it so much that you're playing with them... and you will fall in love with every single boy and girl, just because they love you (and they are really cute).
Then, during the hottest time of the they we tried to have a little siesta back in our house, which was really relaxing, if the power didn't go out (no power...no fan).
Then we went back to the orphanage another time, just for 2-3 hours.
We all were very tired, so most of us went to bed very early :-)
The people you will meet there are so friendly, and alltough they are poor (from our point of view) they seem always happy... And very helpful (if you don't manage to carry a huge bucket of water on your head... african style). They just take more time to do their things than we do, so the response to most of my questions was: "Maybe tomorrow". Keep in mind, this is just Africa
You just need to know that you'll be dirty all the time, even after a shower you won't be really clean (especially not on your feet), but you'll get used to that circumstance very quickly.
... But you can have as much dirt on you as you want, the people in the village will still yell obroni (that means white person) at you. Every time they see you. Really, every time :-)
The only thing you really need, apart from a visa and a yellow fever shot, is an open heart, and you'll enjoy the time in Ghana as much as I did!!