Both countries are great. It was a long time ago when I was there but they are two fairly stable safe countries. Enjoy the hot spicy soup in Ghana, the fou fou and the kenke. Go check out the coast and visit the very well organised historic sites for a good reminder of things that happened in the past. As a single woman traveller its just the normal advice in relation to keeping a watch on what is going on. People are very friendly but there will always be the ones after the tourists. Not wandering on the streets on your own at night time for example. Not leaving a bag on a seat in a cab on its own where someone could grab it. I can always chat more about these things if your OH would like :-)